Duncan Passage is a strait in the Bay of Bengal. It is about wide; it separates Rutland Island (part of Great Andaman and South Andaman administrative division) to the north, and Little Andaman to the south. West of Duncan Passage is the Bay of Bengal; east is the Andaman Sea. It lies within the exclusive economic zone of India protected by the integrated tri-services Andaman and Nicobar Command of Indian Military.
It sits between The Sisters island off South Andaman Island and North Brother Island off Little Andaman with a minimum depth of 21.9 m. 
Manners Strait is the branch of Duncan Passage that lies between North Cinque Island and Rutland Island.
Islands along Duncan Passage.
Several small islands and islets lie along the passage. North to south, they are:
References.
 ;templatestyles src="Reflist/styles.css" / ;