National Chambal Sanctuary, also called the National Chambal Gharial Wildlife Sanctuary, is a 5,400 km² (2,100 sq mi) tri-state protected area in northern India for the critically endangered gharial (small crocodiles), the red-crowned roof turtle and the endangered Ganges river dolphin. Located on the Chambal River near the tripoint of Rajasthan, Madhya Pradesh and Uttar Pradesh, it was first declared in Madhya Pradesh in 1978 and now constitutes a long narrow eco-reserve co-administered by the three states.