Palau contains 340 square miles of land spread across 340 islands in the western Pacific Ocean, approximately 500 miles east of the Philippines and 2000 miles south of Tokyo. The Rock Islands Southern Lagoon received UNESCO World Heritage designation in 2012 for 445 uninhabited limestone islands forming maze-like channels between Koror and Peleliu. These karst formations rise vertically from turquoise water, their bases eroded into mushroom shapes by tidal action over millennia. The islands support 385 coral species and more than 1300 reef fish species within a 100,000-acre marine protected area. Visibility underwater regularly exceeds 100 feet. The concentration of marine biodiversity per square mile ranks among the highest recorded in any ocean.
Jellyfish Lake on Eil Malk island holds an isolated population of golden jellyfish that lost their stinging capability after 12,000 years of separation from ocean predators. The population fluctuates between zero and 10 million individuals depending on El Niño cycles and rainfall patterns. In 2016 the lake warmed beyond tolerable limits and the jellyfish population collapsed completely. By 2019 scientists counted approximately 600,000 individuals, demonstrating population recovery but confirming vulnerability to climate variation. Swimmers enter a $100 permit system limiting daily visitors to 110 people. The lake closes entirely during years when jellyfish counts drop below sustainable thresholds. Four other marine lakes in Palau contain jellyfish populations but remain closed to tourism for conservation.
Blue Corner off Ngemelis Island produces consistent congregations of grey reef sharks, whitetip sharks, barracuda, and Napoleon wrasse in numbers that professional dive instructors describe as unmatched in accessible Pacific locations. Currents reaching three knots require divers to clip onto reef hooks anchored to dead coral, a technique Palau pioneered in the 1980s and other destinations later copied. The site sits in open ocean where the reef drops from 30 feet to beyond 1000 feet, creating nutrient upwelling that attracts pelagic species. Manta rays appear at German Channel during cleaning station activity between December and April. The Palauan government established the world's first shark sanctuary in 2009, banning all commercial shark fishing within the 230,000 square mile exclusive economic zone. Enforcement relies on a single patrol boat and satellite monitoring for vessels over 300 tons.
Babeldaob island covers 153 square miles, making it the second-largest island in Micronesia after Guam. A 53-mile paved road completed in 2007 with Japanese development funding circles the entire island, replacing a partially-graded dirt track that required four-wheel drive vehicles and three hours for the same journey. The road passes through abandoned taro terraces on hillsides where cultivation ended during Japanese occupation from 1914 to 1944. Ngardmau Waterfall drops approximately 100 feet in Babeldaob's interior rainforest, accessible by a 45-minute hike on a maintained trail. The island receives between 150 and 180 inches of annual rainfall depending on elevation. Saltwater crocodiles inhabit Babeldaob's river systems and mangrove channels. The population size remains unconfirmed but wildlife officials verify multiple sightings annually and maintain warning signs at river mouths.
Ngerulmud became Palau's capital in 2006 after the government relocated from Koror to a purpose-built complex on Babeldaob modeled on the United States Capitol building. The structure cost $45 million to construct for a national population under 20,000 people. The legislature contains 16 seats. Most government employees commute from Koror, 12 miles south. The decision to relocate followed decades of debate about population concentration on Koror island, where 11,000 of Palau's 18,000 residents lived on less than three square miles. The capital complex includes no surrounding town, no restaurants, and no commercial development as of 2024.
Palau's population peaked at 50,000 during Japanese administration before World War II when phosphate mining and military construction employed thousands of workers from across the Japanese empire. The Battle of Peleliu in 1944 killed approximately 2000 American soldiers and 10,000 Japanese soldiers over 73 days of fighting for an island measuring two square miles. The strategic value of Peleliu remains historically disputed because American forces bypassed fortified islands elsewhere in the Pacific and proceeded directly to the Philippines. Scuba divers access a Japanese Zero fighter submerged in 50 feet of water off Peleliu's western shore. Artillery pieces, tank remains, and concrete bunkers persist in Peleliu's interior jungle. The island supports fewer than 500 residents in 2024.