Lake Moeris (Ancient Greek: Μοἵρις, genitive Μοίριδος) is an ancient lake in the northwest of the Faiyum Oasis, 80 km (50 mi) southwest of Cairo, Egypt. In prehistory, it was a freshwater lake, with an area estimated to vary between 1,270 km² (490 mi²) and 1,700 km² (656 mi²).