Greece established its first national park in 1938 with the creation of Olympus National Park, which protects 238 square kilometers around Mount Olympus, the country's highest peak at 2,918 meters. The park boundaries were expanded in 1981 to include the entire massif and designated as a UNESCO Biosphere Reserve the same year. Ten national parks now exist across Greece, covering approximately 69,000 hectares of terrestrial area, though this represents less than 1% of the country's total land area. An additional six marine parks protect coastal and marine ecosystems. The national park system operates under the Ministry of Environment and Energy, which delegates day-to-day management to regional park authorities and the Hellenic Ornithological Society for certain marine areas.
Olympus National Park contains 1,700 plant species, representing approximately 25% of all Greek flora within 0.18% of the country's land area. The park encompasses 52 peaks above 2,000 meters, with Mytikas summit reaching 2,918 meters. Ancient Greeks considered this mountain the throne of the twelve Olympian gods. The first recorded ascent of Mytikas occurred on August 2, 1913, by Christos Kakalos, Frederic Boissonnas, and Daniel Baud-Bovy. Eight mountain refuges operate within park boundaries, ranging from 1,100 to 2,700 meters elevation. The E4 European long-distance path crosses the park. Annual visitor numbers exceed 150,000, with most arriving between June and September. Snow covers peaks above 2,500 meters from October through May. The Enipeas Gorge cuts through the eastern slopes, dropping 1,000 meters over 10 kilometers. Black pine forests dominate elevations between 500 and 1,700 meters, transitioning to Bosnian pine and subalpine meadows above. The park shelters 32 mammal species including roe deer, wild boar, and the endangered Balkan chamois, which numbered approximately 20 individuals in a 2019 census.
Vikos-Aoös National Park, established in 1973, covers 126 square kilometers in the Pindus Mountains of northwestern Greece. The park contains Vikos Gorge, listed by Guinness World Records as the world's deepest canyon relative to its width, with walls rising 900 meters above the Voidomatis River while the canyon floor measures only 1,100 meters wide at its narrowest. The gorge extends 12 kilometers from the village of Vitsa to the village of Vikos. The Voidomatis River maintains water temperatures between 4 and 12 degrees Celsius year-round, fed by karst springs. The river received a European Diploma of Protected Areas from the Council of Europe in 2010. Forty-six villages sit within or adjacent to park boundaries, most built between the 14th and 18th centuries when the region prospered from trade routes connecting the Adriatic to Constantinople. Stone-paved kalderimi trails, some dating to Byzantine times, form a network exceeding 100 kilometers through the park. The park records annual precipitation exceeding 1,600 millimeters, among the highest in Greece.
Vikos-Aoös contains 1,800 plant species, including 28 found nowhere else on Earth. The park protects one of Europe's last remaining old-growth beech forests, with individual trees exceeding 400 years of age and 45 meters in height. Greek fir forests occupy higher elevations. The park supports populations of brown bear, gray wolf, and Eurasian lynx, though population densities remain low. Bird species number 182, including golden eagle, griffon vulture, and Egyptian vulture. Stone houses in villages like Papingo and Kipi incorporate architectural features unchanged since the 18th century, using schist slabs for roofing and limestone for walls without mortar in some structures predating 1600.
Parnassus National Park, designated in 1938, encompasses 148 square kilometers around Mount Parnassus, which reaches 2,457 meters at its highest point. Ancient Greeks considered this mountain sacred to Apollo and the Muses, and the Oracle of Delphi, located on the mountain's southern slopes, operated from approximately 800 BCE until 393 CE. The park lies 180 kilometers northwest of Athens. A ski resort operates on the mountain's northern slopes at elevations between 1,600 and 2,260 meters, with 20 kilometers of marked runs. The resort receives an average snowfall of 3 meters per winter season, measured at 1,900 meters elevation. Greek fir forests cover approximately 60% of the park area. The Corycian Cave, situated at 1,370 meters elevation, measures 60 meters long by 40 meters wide. Archaeological excavations in the 1970s uncovered artifacts spanning from Neolithic times through the Roman period. The park contains 850 plant species, including the Cephalonian fir, which exists in scattered groves above 1,600 meters.
Prespa National Park, established in 1974, protects 195 square kilometers surrounding the Prespa Lakes in northwestern Greece near the borders with Albania and North Macedonia. Greater Prespa Lake covers 254 square kilometers total, with 42 square kilometers in Greek territory. Lesser Prespa Lake lies entirely within Greece and covers 43 square kilometers. The lakes sit at 853 meters elevation. Underground channels connect Lesser Prespa to Greater Prespa and to Lake Ohrid in North Macedonia, located 10 kilometers east and 150 meters lower in elevation. The Dalmatian pelican, classified as Near Threatened on the IUCN Red List, maintains one of its largest breeding colonies in Lesser Prespa, with 1,400 breeding pairs counted in 2020. The area supports 1,500 to 2,000 individual pelicans during the breeding season from February through July. Pygmy cormorants numbered 180 breeding pairs in a 2019 census. The park contains 14 Byzantine and post-Byzantine churches, most built between the 10th and 14th centuries. The Church of Panagia Eleousa on an islet in Lesser Prespa dates to the 14th century and contains frescoes from 1409. Fishing villages around the lakes maintain populations between 50 and 300 residents, with many stone houses dating to the 19th century.
Samaria National Park, created in 1962, protects 48 square kilometers in the White Mountains of western Crete. The park centers on Samaria Gorge, which extends 16 kilometers from the Omalos Plateau at 1,250 meters elevation to the Libyan Sea at the village of Agia Roumeli. The gorge's narrowest point, called the Iron Gates, measures 3 meters wide between vertical walls rising 300 meters. The Tarraios stream flows through the gorge, fed by snowmelt and springs. Water flow ranges from negligible in late summer to 50 cubic meters per second during spring snowmelt. The park opens to visitors from May 1 to October 31, weather permitting. Annual visitor numbers averaged 340,000 between 2015 and 2019. The one-way hiking route requires 4 to 7 hours for most visitors. The village of Samaria within the gorge was evacuated in 1962 when the park was established, and its stone houses now serve as ranger stations and rest points. The park protects the Cretan wild goat, known locally as kri-kri, which exists nowhere else in the wild. Population estimates in 2018 counted 2,000 individuals within park boundaries. Cypress trees along the gorge walls include individuals estimated at more than 2,000 years old based on trunk circumference measurements.
Marine areas receive protection through six marine parks established between 1986 and 2010. The National Marine Park of Zakynthos, created in 1999, covers 135 square kilometers of sea and coast around Laganas Bay on the southern coast of Zakynthos island. The park protects primary nesting beaches for the loggerhead sea turtle. Between 900 and 2,300 nests are recorded annually on park beaches, representing approximately 60% of nesting activity in the Mediterranean. Female turtles return to the same beaches where they hatched, typically at 20 to 30 year intervals. The park enforces seasonal restrictions on beach access from dusk to dawn between June 1 and October 31. Fishing regulations prohibit trawling within the bay year-round. The Mediterranean monk seal, with fewer than 700 individuals remaining in the wild, maintains small populations in sea caves along Zakynthos cliffs, though population estimates remain uncertain.
The National Marine Park of Alonissos Northern Sporades, established in 1992, covers 2,260 square kilometers, making it Europe's largest marine protected area by surface area. The park encompasses six islands and 22 uninhabited islets in the northern Aegean Sea. Core protection zones prohibit all fishing and boat traffic within 1.5 nautical miles of certain coastlines. The park protects 300 to 400 Mediterranean monk seals, representing more than half the species' global population. The Monachus Monachus Seal Conservation Society operates a rescue and rehabilitation center on Alonissos island, established in 1988. Posidonia oceanica seagrass meadows cover approximately 450 square kilometers of seabed within park boundaries at depths between 5 and 40 meters. These meadows support fish populations including dusky grouper, which can exceed 50 kilograms and live more than 50 years. Audouin's gull breeds on uninhabited islets within the park, with 220 breeding pairs counted in 2020. Eleonora's falcon nests on cliff faces, with approximately 200 breeding pairs present from April through October before migrating to Madagascar.
Mount Athos, while not designated a national park, functions as a protected area under unique governance established in the Greek Constitution. The peninsula extends 50 kilometers into the Aegean Sea and covers 336 square kilometers. Twenty Eastern Orthodox monasteries govern the peninsula as an autonomous monastic state within Greece since 1046. The Greek Ministry of Foreign Affairs maintains jurisdiction over external relations. Access requires a diamonitirion permit, limited to 100 Orthodox visitors and 10 non-Orthodox visitors per day for non-commercial purposes. No females of any species, domestic or wild, are permitted on the peninsula under monastic rules dating to a 1046 decree, though this prohibition excludes cats, hens, and wild animals. The monasteries maintain archives containing manuscripts dating to the 9th century, with the Great Lavra monastery founded in 963 holding approximately 2,000 manuscripts. Forests cover 75% of the peninsula, with holm oak, kermes oak, and chestnut predominating below 500 meters and black pine above. The peninsula rises to 2,033 meters at the peak of Mount Athos. Monk seal populations inhabit coastal caves, though census data remains unavailable due to access restrictions.
The Schinias-Marathon National Park, designated in 2000, protects 8.2 square kilometers of wetland, beach, and pine forest 42 kilometers northeast of Athens. The park lies adjacent to the Marathon battlefield where Athenian forces defeated the first Persian invasion in 490 BCE. The wetland area covers 210 hectares and provides habitat for 226 bird species, including 90 that breed locally. The park's beach hosted rowing and canoeing events during the 2004 Athens Olympics. Aleppo pine forest covers 330 hectares, planted primarily between 1920 and 1960 on former wetland areas. Environmental restoration projects since 2008 have reconnected 45 hectares of pine forest to tidal flow, converting it back to wetland. The park contains Lake Schinias, a brackish lagoon measuring 0.8 square kilometers with maximum depth of 1.5 meters. Wetland plant species number 420, including sea daffodil, which blooms in August and September on coastal dunes.
Wetland protection extends through the Ramsar Convention, to which Greece became party in 1975. Greece has designated 11 wetlands of international importance under Ramsar criteria, totaling 163,501 hectares. The Amvrakikos Gulf, designated in 2008, covers 114,000 hectares in western Greece and maintains average water depth of 10 meters. The gulf connects to the Ionian Sea through a channel 600 meters wide near the ancient city of Actium. Fresh water enters from the Arachthos and Louros rivers. The wetland supports 300 to 350 bottlenose dolphins, representing one of the Mediterranean's largest enclosed populations. The Amvrakikos Wetlands National Park, established in 2008 within the broader gulf area, protects 300 square kilometers of delta, lagoon, and coastal forest. Reed beds cover 35 square kilometers and provide nesting sites for the purple heron, with 180 breeding pairs recorded in 2019.
The Evros Delta, designated a Ramsar site in 1971, covers 188 square kilometers at the mouth of the Evros River where it enters the Aegean Sea at the border with Turkey. The delta contains 318 bird species, representing approximately 70% of all bird species recorded in Greece. The greater flamingo winters here in flocks exceeding 2,000 individuals. White stork populations numbered 73 breeding pairs in 2020. The delta serves as a critical stopover for migratory birds traveling between Eastern Europe and Africa. Daily counts during peak migration in April have exceeded 200,000 individual birds. The river forms the border with Turkey for 203 kilometers of its total 530-kilometer length. Seasonal flooding inundates up to 70% of the delta area between February and April. Rice cultivation on 150 square kilometers of delta farmland provides feeding habitat for migrating waterfowl. The area operated as a military zone with restricted access until 2000.
Forest coverage in Greece totals approximately 39,000 square kilometers, representing 30% of total land area according to 2020 Forest Service data. However, definitions of forest vary between agencies. The Hellenic Statistical Authority records 65,000 square kilometers of forest and semi-natural areas, representing 50% of land area when scrubland and degraded forest are included. Aleppo pine dominates coastal areas and islands. Calabrian pine forests occur on higher elevation mountains. Greek fir exists only in Greece, primarily in mountainous regions of the Peloponnese and central Greece. Oak forests, both deciduous and evergreen species, cover extensive areas below 1,000 meters. Chestnut forests occupy valleys in northern Greece. Forest fires burn an average of 450 square kilometers annually, based on data from 2010 through 2020. The 2007 fire season burned 2,700 square kilometers, the largest area since record-keeping began in 1955. The 2021 fires burned 1,250 square kilometers, concentrated in the Peloponnese and Euboea. Fire season extends from June through September, with peak activity in July and August when relative humidity often falls below 15% and temperatures exceed 38 degrees Celsius.
Cave systems provide specialized habitats with varying levels of protection. The Perama Cave near Ioannina extends 1,100 meters through limestone, with a public tour route covering 600 meters. The cave was discovered in 1940 during the Greco-Italian War. Speleothems include stalactites, stalagmites, and columns formed over 1.5 million years based on geological analysis. The Diros Caves on the Mani Peninsula in the southern Peloponnese comprise three caves, with Glyfada Cave open to tourists via an underground river route covering 1,200 meters by boat and 300 meters on foot. The total surveyed length of the Diros system exceeds 15 kilometers. Water temperature remains constant at 12 degrees Celsius. Bones of panthers, hyenas, and Pleistocene fauna were excavated from Alepotrypa Cave, part of the same system, during excavations from 1970 through 2010. Radiocarbon dating places habitation from approximately 6,000 to 3,200 BCE.
The Dadia-Lefkimi-Soufli Forest National Park, established in 1980 and expanded to its current 358 square kilometers in 2006, protects oak and black pine forest in northeastern Greece near the border with Turkey. The park contains 36 of Europe's 38 raptor species. Black vulture populations numbered 25 breeding pairs in 2020, representing one of only two viable breeding populations in the Balkans. Griffon vultures numbered 70 breeding pairs in the same census. The imperial eagle, classified as Vulnerable on the IUCN Red List, maintains 3 to 5 breeding pairs. Core protection zones covering 73 square kilometers prohibit public access during breeding season from February through July. Artificial feeding stations provide livestock carcasses to support vulture populations, a practice initiated in 1987 when vulture numbers reached critically low levels. The forest consists primarily of Hungarian oak, Quercus frainetto, which covers 180 square kilometers. Wild boar, roe deer, and red fox populations support the raptor community.