Pulau Kukup (English: Kukup Island) is a mangrove island located at about 1 km offshore from the 150 year-old fishing village of Kukup in Pontian, at the South-western region of the state of Johor, and towards North-west of Tanjung Piai, Peninsular Malaysia. The area of the island is 6.472 square kilometres and is surrounded by 8 square kilometres of mudflats. Pulau Kukup's status as a remote hinterland changed in the 1990s when scientists began focusing on the island's biodiversity a unique ecological characteristics.