The islands cluster into three groups. The northern group includes Car Nicobar (127 km²) and uninhabited Batti Malv (2 km²). The central group includes Chowra (8 km²), Teressa (101 km²), Poahat (13.3 km²), Katchal (174 km²), Camorta (188 km²), Nancowry (67 km²), and Trinket (86 km²); the Isle of Man and Tillangchong (17 km²) are uninhabited. Tillangchong is a wildlife sanctuary. The southern group includes Great Nicobar (1045 km²), Little Nicobar (157 km²), Kondul (4 km²) and Pulomilo (1 km²); the islets of Meroe, Trak, Treis, Menchal, Cubra, Pigeon, and Megapod are uninhabited. Megapod is a wildlife sanctuary.