Oriental Mindoro (Spanish: Mindoro Oriental) is a province of the Philippines located in the island of Mindoro under MIMAROPA region in Luzon, about 140 km southwest of Manila. The province is bordered by the Verde Island Passage and the rest of Batangas to the north, by Marinduque, Maestre de Campo (or known as Sibale but official name is Concepcion) Island, Tablas Strait and the rest of Romblon to the east, by Semirara and the rest of Caluya Islands, Antique to the south, and by Occidental Mindoro to the west. Calapan City, the only city in the island, is the provincial capital.
Oriental Mindoro is touted as the country's emerging eco-tourism destination. In 2005, the Philippines was found to be the center of marine fish biodiversity and the home of the most diverse marine ecosystem in the world, by American biologists Kent Carpenter and Victor Springer. Most of the endemic species in the Philippines are found in the Verde Island Passage between Mindoro island and the main island of Luzon. The passage houses 2,983 individual species of algae, corals, crustaceans, mollusks, fishes, marine reptiles, and marine mammals, based on a study conducted by scientists Carpenter and Springer in 2005.
Our study indicates, however, that there is a higher concentration of species per unit area in the Philippines than anywhere in Indonesia, including Wallacea... Special attention to marine conservation efforts in the Philippines is justified because of the identification of it as an epicenter of biodiversity and evolution.
UNESCO, declared Puerto Galera a biosphere reserve under its Man and the Biosphere Programme in the 1970s. The Verde Island Passage is at the apex of the so-called Coral Triangle – the Philippines, Indonesia, and Malaysia – which has the distinction of being the "global center of marine biodiversity".