Kadmat Island (Malayalam: കടമത്ത്), also known as Cardamom Island, is a coral island belonging to the Amindivi subgroup of islands of the Lakshadweep archipelago in India. Measuring 9.3 kilometres (5.8 mi) in length, the island has a lagoon with a width of 1.5 kilometres (0.93 mi) covering an area of 25 square kilometres (9.7 sq mi). The ecological feature of the island is of coral reef with seagrass, and marine turtles which nestle here. The Ministry of Environment and Forests (India) has notified the island as a marine protected area for ensuring conservation of the island's animal, plant, or other type of organism, and other resources.
The only inhabited village on the island is Kadmat, which had a population of 5,389 according to 2011 census. Fisheries is the main economic activity on the island with agriculture limited to 5% of the land area. Tourism is allowed even for non-Indians and the attractions are kayaking, snorkeling and leisure trips by a glass-bottomed boat for scuba diving.
Kadmat Island, which belongs to the township of Kadmat Island of Aminidivi Tehsil. is the central most island of the Lakshadweep archipelago. It is in the shape of a tear drop, with 3.5 square kilometres (1.4 sq mi) area and is located on a coral reef. With a length of 9.3 kilometres (5.8 mi) from north to south and a maximum width of 0.57 kilometres (0.35 mi) and it is the longest island in the Amindivi group. Its southern end is the narrowest with a width of about 10 metres (33 ft). The island's topography is about 2.0 to 3 metres (6 ft 7 in to 9 ft 10 in) on the eastern side and 2.0 to 4 metres (6 ft 7 in to 13 ft 1 in) on the western part above the mean sea level. Its surface formation consists of coral conglomerate overlying broken pieces of coral and coral sand.