Pantar (Indonesian: Pulau Pantar) is the second largest island in the Indonesian Alor Archipelago, after Alor. The island is about 50 km north-to-south, and varies from 11 to 29 km in east-west width. It has an area of 728 km².
The island consists of two distinct geographic zones. The eastern zone is dominated by a range of verdant hills which drop steeply to the coast of the Alor Strait. The western zone is relatively flat, consisting of a plain which gently slopes to the west from the 900 m active volcano, Mt. Sirung.