Both rivers flow into the Aral Sea basin and provide some 55 per cent of the overall run-off into the basin. Currently, however, after a long journey through a number of countries, natural seepage, evaporation and heavy exploitation, only the Syr Darya River retains an inflow to the Aral Sea. After the confluence of the Kafirnigan, Vakhsh and Pjandj rivers, the flow becomes the Amu Darya River. They are fed by intakes from rivers and connected to the groundwater through seepage and leaks. They contain 20 km3 of freshwater and 26.3 km3 of salty or muddy water.