Kapchagay Reservoir, also spelled Qapshaghay Bogeni Reservoir and sometimes referred to as Lake Kapchagay, is a major reservoir in Almaty Province in southeastern Kazakhstan, approximately 60 kilometres north of Almaty. The 140 kilometre long lake is formed by a dam on the Ili River which flows from the mountains in the east towards Lake Balkhash to the northwest. It is named after the town of Kapchagay, which is located on its western bank.