Lake No. 6 is located 3 kilometres east of Big Bar Lake (EMPR Bulletin #4), and 1.5 kilometres north of Liberty Lake. It is 22 kilometres west of 70 Mile House.

The lake is a semi-evaporitic playa lake. It is located in the "Green Timber Plateau" area (EMPR Bulletin 4), a semi-arid plateau area averaging 1130 metres elevation which is part of the Cariboo Plateau and host to several playa lakes. The area is underlain by alkaline plateau basalt flows of the Miocene to Pleistocene Chilcotin Group, mantled by a thin cover of glacial till and glaciofluvial sediments. Annual precipitation averages between 300 and 400 millimetres (EMPR Paper 1991-1).

Lake No. 6 contains sodium carbonate-rich brine approximately 15 centimetres thick over an area of approximately 3.6 hectares (EMPR Bulletin 4, page 10). The brine is moderately dense with a specific gravity of 1.033. Evaporated solids consisted of 80.5% sodium carbonate and 14.0% sodium sulphate. No alkaline eflorescence or "winter crystal" is prresent in the lake. Canadian Occidental Petroleum staked the Soda 56, 57 and 58 claims in 1989, collected three water samples and completed analyses for sodium carbonate and other alkalai salts (Assessment Report 20080). Canoxy also completed an airborne infrared survey to test for dissolved solids in the lakewaters.