South Brother Island is an uninhabited island in theIndian Ocean, part of theAndaman Archipelago. It is located in theDuncan Passage, about 9.5kilometre northeast ofLittle Andaman Island. It is part of theSouth Andaman district of theAndaman and Nicobar Islands, aUnion Territory of India.
The island is roughly bean-shaped, about 1800m by 630 m, with a broad bay on the north side. It is almost flat, thickly wooded, fringed by a narrow beach and surrounded by a reefs. The central part is depressed and becomes a lake in the rainy season.[1] The island hosts a 1.24km2wildlife sanctuary, established 1987.[2]
By the end of the 19th century, the island was occasionally visited by theOnge of Little Andaman to catchsea turtles; one explorer reports finding huts "with neatcharpoys ofbamboos" capable of holding 30 people. The island seemed to be their limit in disputes with theGreat Andamanese.[1] It has been conjectured to be part of the route for the Onge expansion into southGreat Andaman Island in the wake of the Great Andamanese tribes, around 1890 to 1930.[1][3]