The Philippines is an archipelago of 7,107 islands stretching from the southern coast of China to the northern tip of Borneo. It covers a total land area of about 347,681 square kilometers (134,240 square miles) and sits in the western Pacific Ocean, shaped by volcanic activity, tectonic collisions, and tropical weather systems that together create one of the most geographically dynamic countries on Earth.
Three Major Island Groups
The archipelago is organized into three broad island groups: Luzon in the north, the Visayas in the center, and Mindanao in the south. Luzon is the largest and most populous island, home to the capital city of Manila and the long Sierra Madre mountain range running along its northeastern coast. Mindanao, the second largest, contains the country’s highest peak and extensive river systems. The Visayas sit between the two, a cluster of smaller islands including Cebu, Panay, Negros, Leyte, and Samar.
Despite having over 7,000 islands, only about 2,000 are inhabited. Many of the smaller islands are little more than rocky outcrops or sandbars. The inhabited ones range from densely urbanized areas to remote communities accessible only by boat.
Mountains and Volcanoes
Mountainous terrain dominates much of the Philippine landscape, with narrow coastal plains giving way quickly to steep highlands across most of the major islands. The highest point is Mount Apo on Mindanao, a dormant stratovolcano that reaches 2,954 meters (9,692 feet). It sits within the Apo-Talomo Mountain Range, one of several significant ranges across the archipelago. On Luzon, the Sierra Madre runs roughly 350 kilometers along the eastern coast, forming the island’s geographic backbone.
The Philippines has 23 volcanoes that have erupted during the current geological epoch. Several remain persistently active. Mayon, famous for its near-perfect cone shape in the Bicol region of Luzon, has erupted repeatedly in recent years. Taal, located in a lake south of Manila, has shown continuing volcanic activity since 2024. Kanlaon on Negros island has also been active into 2025. Mount Pinatubo, whose massive 1991 eruption was one of the largest of the 20th century, last showed minor activity in late 2021.
Tectonic Activity and Earthquakes
The Philippines sits in an unusually complex tectonic zone. Subduction systems face in opposite directions on either side of the archipelago. On the east, the Philippine Sea Plate dives beneath the islands along the Philippine Trench. On the west, the Sunda Plate subducts eastward along the Manila Trench and several smaller trenches farther south.
Cutting through the middle of it all is the Philippine Fault, a major transform fault stretching over 1,200 kilometers through the heart of the island chain. This fault alone has produced devastating historical earthquakes, including the 1990 Luzon earthquake (magnitude 7.6), which killed roughly 2,400 people. Across the broader plate boundaries, seismic activity has generated 7 great earthquakes above magnitude 8.0 and 250 large events above magnitude 7. Several other active fault systems, including the Cotabato Fault in Mindanao, add to the seismic risk.
Coastline and Surrounding Seas
The Philippines has 36,289 kilometers (22,549 miles) of coastline, the fifth longest of any country in the world. That enormous figure reflects the irregular, deeply indented shape of the islands, with countless bays, peninsulas, and narrow straits creating a complex shoreline.
Three major bodies of water border the archipelago. The Philippine Sea lies to the east, connecting the islands to the open Pacific. The South China Sea borders the western side, separating the Philippines from Vietnam and mainland Southeast Asia. To the south, the Celebes Sea sits between Mindanao and the Indonesian island of Sulawesi. Internally, narrower seas and passages separate the islands from one another, including the Sibuyan Sea, the Visayan Sea, and the Sulu Sea.
Rivers and Lakes
Philippine river systems generally trend northward, shaped by the mountain ranges that run along the spines of the larger islands. The longest is the Cagayan River on Luzon, which flows about 350 kilometers (220 miles) through a twisting course originating in the Sierra Madre before emptying into the Babuyan Channel on the northern coast. The Cagayan Valley it carves out is one of the country’s most important agricultural regions.
The largest lake is Laguna de Bay, covering 891 square kilometers (344 square miles) just southeast of Manila. It serves as a freshwater fishery, a water source, and a flood basin for the surrounding metro area. Lake Lanao on Mindanao is the second largest and sits at a much higher elevation, formed in a volcanic depression. Taal Lake, which contains the volcanic island where Taal Volcano sits, is another notable body of water, essentially a crater lake within a much larger ancient caldera.
Climate and Typhoons
The Philippines has a tropical maritime climate, meaning warm temperatures year-round with high humidity and heavy rainfall. Temperatures in lowland areas typically range from about 25°C to 32°C (77°F to 90°F), though higher elevations are considerably cooler. The country experiences a wet season roughly from June through November and a drier stretch from December through May, though rainfall patterns vary significantly between the eastern and western sides of the islands.
Typhoons are a defining feature of Philippine geography. An average of 20 tropical cyclones form in or pass through the Philippine Area of Responsibility each year, with about 8 or 9 making direct landfall. The eastern Visayas and northeastern Luzon bear the brunt of most storms, which typically arrive from the Pacific between July and December. These cyclones bring extreme rainfall, storm surges, and landslides that reshape coastlines and river systems year after year.
Biodiversity and Ecosystems
The geography of the Philippines has produced extraordinary biodiversity. The combination of island isolation, tropical climate, and varied terrain, from coastal mangroves to montane cloud forests, created conditions for species to evolve independently across different islands. The result is one of the world’s most important biodiversity hotspots.
Over 530 bird species are found in the Philippines, and about 185 of them (35 percent) exist nowhere else on Earth. Seven distinct Endemic Bird Areas have been identified across the archipelago, spanning islands from Palawan in the west to Mindanao in the south. Mammal endemism is even more striking: of at least 165 mammal species in the Philippines, over 100 (61 percent) are endemic, one of the highest rates in any biodiversity hotspot in the world. Many of these species are restricted to single islands or mountain ranges, making them especially vulnerable to habitat loss.
Coral reefs fringe much of the coastline, particularly in the Coral Triangle region where the Philippines overlaps with the most biodiverse marine environment on the planet. Tubbataha Reefs in the Sulu Sea and the Apo Reef off Mindoro are among the most significant reef systems in Southeast Asia.