Preparis is an
island located between the
Bay of Bengal and the
Andaman Sea, 77 km to the NNE of the
Coco Islands and 133 km to the SSW from
Cape Negrais, the nearest point in the coast of
Burma. The island makes up the northern end of the
Andaman Islands chain. The island is 7 km long and has a maximum width of 1.8 km. It is covered with dense forest and has gentle slopes rising to a maximum height of 81 m.