Mangarin Bay is situated to the east of Mangarin Point, on the west coast of Mindoro, among the Philippine Islands.[1] The bay is shoal and sheltered from the wind by the point and Ilin Island.[1] Magarin point terminates in a long sandy pit off which the depth is 4 to 5 fathoms.[1] Farther in the water shoals rapidly; the town of Mangarin is only accessible by light boat.[1] The surroundings are marshy, and few supplies are to be had there.[1]