Adams Lake is a large, deep, coldwater lake in British Columbia, Canada; its average depth ranks 6th in the world. The southern end of the lake is approximately 30 km (19 mi) north of the town of Chase in the Shuswap Country region of British Columbia. The lake's upper reaches lie in the northern Monashee Mountains, while its lower end penetrates the Shuswap Highland. The lake supports Chinook, Sockeye and Coho salmon, Kokanee, mountain whitefish and rainbow trout.

The lake is 63 km (39 mi) long and between 1.6 kilometres (0.99 mi) and 3.2 kilometres (2.0 mi) wide. The surface elevation is 404 metres (1,325 ft) above sea level. The lake has a mean depth of 299 metres (981 ft) and maximum depth of 457 metres (1,499 ft) it is the second deepest lake in British Columbia and 6th deepest lake in the world by mean depth.

Water flows into the lake though many tributaries (most notably the Upper Adams River, Momich River, and Bush Creek). The water drains from the lake as the Lower Adams River which is home to a very large and famous sockeye salmon run which attracts visitors to the region each year. From there the water flows into Shuswap Lake, and down the Thompson River.

The vast majority of the lake is undeveloped. The lack of development is partially due to the nature of the shoreline, which is mostly sheer rock faces or steep, stony beaches. Some man-made sandy beaches have been created for public use, for example at Adams Lake Provincial Park.

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