The Philippines is an archipelagic country in Southeast Asia, situated in the western Pacific Ocean. It consists of about 7,641 islands, which are categorized broadly under three main geographical divisions from north to south: Luzon, Visayas, and Mindanao. The capital is Manila, a densely populated bayside city on the island of Luzon. Due to its location on the Pacific Ring of Fire and close to the equator, the Philippines is prone to earthquakes and typhoons but also enjoys abundant natural resources and some of the world's greatest biodiversity. The terrain is mostly mountainous with narrow coastal lowlands. Notable features include the Chocolate Hills in Bohol and the Underground River in Palawan. The country has a tropical maritime climate with two distinct seasons: wet and dry. The Philippines is the only predominantly Christian nation in Southeast Asia, a legacy of over 300 years of Spanish colonial rule.