South Andaman Island is the southernmost island of the Great Andaman and is home to the majority of the population of the Andaman Islands. Port Blair, the capital of the islands, is located on the southern part of this island. Some areas of the island are restricted areas for non-Indians; however, transit permits can be obtained from the Home Ministry. Like the rest of the archipelago, it was struck by the 2004 Indian Ocean earthquake, leading to many deaths on the island.

South Andaman is the third largest island in the island group. It is located immediately south of Middle Andaman Island, from which it is separated only by a narrow channel, a few hundred meters wide. The island is 93 km long and 31 km in width. Its area is 1348 km². It had a population of 181,949 at the 2001 census.

South Andaman is less mountainous than the more northerly of the Andaman Islands. Koiob reaches a height of 456.6 meters

South Andaman district is one of the 3 districts of the Indian Union Territory of Andaman and Nicobar Islands located in the Bay of Bengal. Port Blair town, the capital of the Union Territory is the district headquarters. The area covered by this district is 2980 km

According to the 2011 census South Andaman district has a population of 237,586, roughly equal to the nation of Vanuatu.This gives it a ranking of 584th in India (out of a total of 640).The district has a population density of 80 inhabitants per square kilometre (210/sq mi) .Its population growth rate over the decade 2001-2011 was 13.97%. South Andaman has a sex ratio of 874 females for every 1000 males,and a literacy rate of 88.49%