Saint Martin Island is a small island in the northeastern part of the Bay of Bengal, about 9 km south of the tip of the Cox's Bazar-Teknaf peninsula, and forming the southernmost part of Bangladesh. There is a small adjoining island that is separated at high tide, called Chera Dip. It is about 8 kilometres west of the northwest coast of Myanmar, at the mouth o…Saint Martin Island is a small island in the northeastern part of the Bay of Bengal, about 9 km south of the tip of the Cox's Bazar-Teknaf peninsula, and forming the southernmost part of Bangladesh. There is a small adjoining island that is separated at high tide, called Chera Dip. It is about 8 kilometres west of the northwest coast of Myanmar, at the mouth of the Naf River.