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.