The water level in Kazakhstan’s Lake Balkhash has increased by 32 centimeters during the first half of 2025, rising from 341.55 to 341.87 meters above sea level, based on the Baltic height system, according to data released by Kazakhstan’s Ministry of Water Resources and Irrigation.
Located approximately 280 kilometers northwest of Almaty, Lake Balkhash is one of Asia’s largest inland bodies of water and ranks as the fifteenth-largest lake in the world by surface area.
Since the beginning of 2025, 8.52 billion cubic meters of water have been discharged from the Kapchagay Reservoir in the Almaty region into Lake Balkhash. This marks an increase from 8 billion cubic meters over the same period in 2024. Officials expect total inflow from the reservoir to reach approximately 12 billion cubic meters by year-end.
The lake’s hydrological health is closely tied to the transboundary Ili River, which originates in China and supplies nearly 70% of Lake Balkhash’s total inflow. The Ili’s flow is regulated by the Kapchagay Reservoir, which in 2025 is at full capacity for the second consecutive year, a milestone not seen in over a decade. The reservoir had previously reached full capacity in 2024 for the first time in ten years.
In December 2024, Kazakhstan signed a cooperation agreement with the French Development Agency (AFD) and the French Geological Survey (BRGM) to support a long-term conservation effort for Lake Balkhash. The agreement outlines a comprehensive study of the lake basin and the development of a sustainability strategy through 2040, aiming to safeguard one of Central Asia’s most ecologically and economically significant water bodies.
