Mangarin Bay is situated to the east of Mangarin Point, on the west coast of Mindoro

Mindoro

Mindoro is the seventh-largest island in the Philippines. It is located off the coast of Luzon, and northeast of Palawan. The southern coast of Mindoro forms the northeastern extremum of the Sulu Sea.-History:...

, among the Philippine Islands. The bay is shoal

Shoal

Shoal, shoals or shoaling may mean:* Shoal, a sandbank or reef creating shallow water, especially where it forms a hazard to shipping* Shoal draught , of a boat with shallow draught which can pass over some shoals: see Draft...

 and sheltered from the wind by the point and Ilin Island. Magarin point terminates in a long sandy pit off which the depth is 4 to 5 fathoms. Farther in the water shoals rapidly; the town of Mangarin is only accessible by light boat. The surroundings are marshy, and few supplies are to be had there.