Cheakamus Lake is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

Garibaldi Provincial Park Garibaldi Provincial Park, also called Garibaldi Park, is a wilderness park located on the coastal mainland of British Columbia, Canada, 70 kilometres (43.5 mi) north of Vancouver. It was established in 1920 and named a Class A Provincial P ...

on the southeastern outskirts of the resort municipality of

Whistler, British Columbia Whistler ( Lillooet/Ucwalmícwts: Cwitima, ; Squamish/Sḵwx̱wú7mesh: Sḵwiḵw, ) is a resort municipality in Squamish-Lillooet Regional District, British Columbia, Canada. It is located in the southern Pacific Ranges of the Coast Mounta ...

. It has an area of 5.7 km² (2.2 mi²). It is an expansion of the upper

Cheakamus River The Cheakamus River (pron. CHEEK-a-mus) is a tributary of the Squamish River, beginning on the west slopes of Outlier Peak in Garibaldi Provincial Park upstream from Cheakamus Lake on the southeastern outskirts of the resort area of Whistler. T ...

, with the river entering it at its east end and exiting at the west end. In 2005, 40,000 litres of

sodium hydroxide Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations and hydroxide anions . Sodium hydroxide is a highly caustic base and alkali ...

were spilled into the Cheakamus River, well downstream of the lake, as a result of a CN train derailment.CN faulted for Squamish derailment
The Globe and Mail

References

Lakes of British Columbia Sea-to-Sky Corridor New Westminster Land District {{SquamishLillooet-geo-stub