Cagayancillo in the context of "Municipality of the Philippines"

The Sulu Sea (Filipino: Dagat Sulu; Tausug: Dagat sin Sūg; Malay: Laut Sulu; Spanish: Mar de Joló) is a body of water in the southwestern area of the Philippines, separated from the South China Sea in the northwest by Palawan and from the Celebes Sea in the southeast by the Sulu Archipelago. Borneo is found to the southwest and Visayas to the northeast.

The Sulu Sea contains a number of islands. The Cuyo Islands and the Cagayan Islands are part of the province of Palawan whereas Mapun and the Turtle Islands are part of the province of Tawi-Tawi. Sulu Sea is also where the Tubbataha Reef National Marine Park, one of the World Heritage Sites is located.

The Tubbataha Natural Park, also known as the Tubbataha Reefs Natural Park (Filipino: Bahurang Tubbataha), is a protected area of the Philippines located in the middle of the Sulu Sea. The marine and bird sanctuary consists of two huge atolls (named the North Atoll and South Atoll) and the smaller Jessie Beazley Reef covering a total area of 97,030 hectares (239,800 acres; 374.6 sq mi). It is located 150 kilometres (93 mi) southeast of Puerto Princesa, the capital of Palawan. The uninhabited islands and reefs are part of the island municipality of Cagayancillo, located roughly 130 kilometers (81 mi) to the northeast of the reef.

In December 1993, the UNESCO declared the Tubbataha Reefs National Park as a World Heritage Site as a unique example of an atoll reef with a very high density of marine species; the North Islet serving as a nesting site for birds and marine turtles. The site is an excellent example of a pristine coral reef with a spectacular 100-m perpendicular wall, extensive lagoons and two coral islands. In 1999, Ramsar listed Tubbataha as one of the wetlands of international importance. In 2008, the reef was nominated at New7Wonders of Nature.