Latvia protects 12.5 percent of its territory through a network of four national parks, 260 nature reserves, four biosphere reserves, and 355 nature monuments. The protected areas system originated in 1912 when the Moricsala Nature Reserve was established on an island in Lake Usma, making it one of the oldest nature reserves in Europe. The modern national park system began in 1973 with the designation of Gauja National Park. The Nature Conservation Agency, established in 2018 from the merger of the Nature Protection Board and State Forests, administers these territories. Latvia's protected areas differ from many European counterparts by maintaining human settlement and traditional land use within park boundaries rather than enforcing strict wilderness zones.
Gauja National Park covers 91,745 hectares along a 100-kilometer stretch of the Gauja River valley in Vidzeme. Established on September 14, 1973, it became the first national park in Latvia and the Soviet Union's Baltic republics. The Gauja River has carved a valley reaching depths of 85 meters below the surrounding plateau, creating 500-million-year-old Devonian sandstone outcrops along 90 kilometers of riverbank. These cliffs contain more than 500 caves and grottos, including Gutmanis Cave, which extends 18.8 meters into the rock face with a 10-meter-wide entrance and 4.5-meter ceiling height, making it the largest cave in the Baltic countries. The cave walls hold inscriptions dating to the 17th century. The park contains 924 plant species, 149 bird species including black storks and lesser spotted eagles, and 48 mammal species. Forests occupy 47 percent of the park area, dominated by Scots pine, Norway spruce, and silver birch on the sandy soils typical of the Gauja ancient valley. The Gauja achieves flow rates between 10 and 300 cubic meters per second depending on season, with spring floods reaching peaks in April.
Nine medieval castles and castle ruins stand within Gauja National Park boundaries. Turaida Castle, constructed between 1214 and 1226 by the Archbishopric of Riga, occupies a ridge above the Gauja with a 35-meter-tall round tower built from Devonian dolomite. The castle fell to Swedish forces in 1621 and burned in 1776, remaining in ruins until restoration began in 1953. Cēsis Castle dates to 1209 when the Livonian Brothers of the Sword built the original fortress. The castle complex grew to include walls up to 4 meters thick and a main tower reaching 30 meters. Polish-Swedish wars damaged the structure in 1703, and it deteriorated until conservation work started in 1974. Sigulda Medieval Castle, built by the Livonian Order around 1207, retains only the north gate tower to its full 25-meter height. These fortifications demonstrate the Livonian Crusade's progression through the Gauja valley during the 13th century.
The park supports recreational infrastructure including 15 marked hiking trails totaling 208 kilometers, seven canoe routes covering 157 kilometers of river, and three cycling routes extending 266 kilometers. The Līgatne Nature Trails occupy 4.8 kilometers through a former Soviet-era wildlife observation area where European bison, elk, red deer, wild boar, lynx, brown bear, and wolves inhabit 25-hectare enclosures. These animals derive from the last free-ranging populations in Latvia before regional extinctions between 1880 and 1917. Forty kilometers of bobsled track operate at Sigulda, constructed in 1986 for Soviet Olympic training with modern refrigeration systems allowing year-round operation at track temperatures of minus 5 degrees Celsius. The Gauja's sandstone formations create rock climbing routes graded from 4a to 7b+ on the French system, concentrated at the Sietiņiezis outcrop where the cliff reaches 22 meters vertical.
Slītere National Park occupies 26,427 hectares at the northern tip of the Kurland Peninsula where Cape Kolka marks the confluence of the Gulf of Riga and Baltic Sea. The park received designation on March 16, 1999, though the core Slītere Nature Reserve dates to 1921. Cape Kolka sits at coordinates 57°44′N 22°35′E, where opposing currents from the gulf and sea create visible wave interference patterns extending 100 meters offshore. The meeting point shifts between 10 and 500 meters depending on wind direction and tidal phase. The park contains 15,000 hectares of forest including 6,000 hectares of protected old-growth stands never subjected to clear-cutting. These forests preserve naturally occurring Scots pine reaching 250 years age and 32 meters height, with trunk diameters exceeding 70 centimeters. The UNESCO included Slītere in the North Vidzeme Biosphere Reserve in 1997, recognizing the intact transition from marine to forest ecosystems.
The Slītere Blue Cow cliff rises 15 meters above sea level where the Baltic Sea erodes glacial till deposits containing blue clay seams. Wave action undercuts the cliff at rates between 0.5 and 2 meters per year depending on storm frequency, creating continual collapse of the overlying sand and gravel layers. Coastal erosion exposes cross-bedded sediments deposited during the Littorina Sea phase 7,500 to 4,000 years ago when the Baltic achieved higher salinity than present. The park's coastline extends 55 kilometers along the Baltic and 15 kilometers along the Gulf of Riga, encompassing beach ridge systems pushed inland during storm surges that have achieved run-up heights of 3.2 meters above mean sea level during documented events. The Slītere Lighthouse, built in 1849 and rising 37 meters, provides orientation for vessels navigating the cape's shallow banks where depths reach only 2 to 4 meters up to 2 kilometers offshore.
Livonian coastal villages within the park boundaries preserve the northernmost settlement area of the Livonian people, a Finnic ethnic group whose language reached fewer than 30 fluent speakers by 2010. The villages of Mazirbe, Košrags, and Vaide maintained Livonian cultural practices including traditional fishing methods using 30-meter beach seines operated from shore and smoked flounder preserved in seaside smokehouses. The Livonian Community House in Mazirbe, opened in 1939, serves as the cultural center for the remaining population of Livonian descent, which numbered 250 individuals identifying as Livonian in the 2011 census though none used Livonian as their primary language. The park administration restricts vehicle access to the coast during summer months, maintaining the isolation that allowed Livonian culture to persist when surrounding areas underwent Latvian and German cultural assimilation during the 18th and 19th centuries.
Ķemeri National Park covers 38,165 hectares on the Gulf of Riga coast 40 kilometers west of Riga, designated on July 19, 1997. The park encompasses the Great Ķemeri Bog, which extends across 6,189 hectares and reaches peat depths of 9 meters accumulated over 9,000 years of wetland development. The bog surface rises 2 to 3 meters above surrounding mineral soils, creating a raised bog morphology where precipitation provides the only water and nutrient input. Sphagnum moss species dominate the bog vegetation, achieving growth rates of 2 to 5 millimeters per year while older peat layers compress at rates offsetting approximately 1 millimeter of annual accumulation. The bog supports 26 peat lake formations ranging from 10 to 100 meters diameter, formed where peat accumulation creates impermeable layers trapping water in surface depressions. Water in these lakes achieves pH values between 3.5 and 4.2 due to organic acids released by sphagnum decomposition.