Jatun Pucacocha is a lake in Peru located in the Cusco Region, Quispicanchi Province, Ocongate District. It is about 0.9 km long and 0.58 km at its widest point. Jatun Pucacocha lies southwest of the mountain Ausangate of the Vilcanota mountain range, between the lakes Uchuy Pucacocha in the northwest and Pucacocha in the southeast.