The Central Asian Internal Drainage Basin is the largest and includes the Great Lakes Depression, including Lake Uvs, Lake Khar-Us, Lake Khar and Lake Khyargas. Mongolia's water resources are distributed unevenly throughout the country (with sufficient water resources in the north and extremely limited resources in the south). The flow of rivers is not stable. This is a result of the severe winter, which holds down the rivers for half a year and reduces or stops the flow, reduction of precipitation from north to south, and aridity' of the Gobi Desert region, where a lot of water is lost because of evaporation and infiltration.