Wallago attu is a freshwater catfish of Siluridae family, native to South and Southeast Asia. It is commonly known as helicopter catfish or wallago catfish. Some regional designations, such as the Indian Sareng, the Bengal Boal or the Malaysian and Indonesian Tapah are also occasionally used in English. W. attu is found in large rivers and lakes in two geographically disconnected regions (disjunct distribution), with one population living over much of the Indian Subcontinent and the other in parts of Southeast Asia. The species can reach a total length of 1 m (3 ft 3 in).