Lake George is an endorheic lake in south-eastern New South Wales, Australia. It is approximately 40 kilometres (25 mi) north-east of Canberra located adjacent to the Federal Highway en route to Goulburn and Sydney. Lake George is also the name of a locality on the western and southern edges of the lake, within the area of the Queanbeyan–Palerang Regional Council.

An endorheic basin is a drainage basin that normally retains water and allows no outflow to other, external bodies of water ; instead, the water drainage flows into permanent and seasonal lakes and swamps that equilibrate through evaporation. Endorheic basins are also called closed basins, terminal basins, and internal drainage systems.