Ansoo Lake is a high-altitude lake (elevation 16,492 feet or 5,027 metres) in the Kaghan Valley in the Mansehra District of the Khyber-Pakhtunkhwa province of Pakistan. It can be reached by a difficult trek from Saiful Mulook Lake and requires physical and mental fitness. The name “Ansoo” comes from its tear-like shape (the Urdu word Ansoo means teardrop). The lake is said to have been discovered in 1993 by Pakistan Air Force pilots who were flying low above the area. Earlier, the lake was not even known to the locals.