High Quality Content by WIKIPEDIA articles Okanagan Lake is a large, deep lake in the Okanagan Valley of British Columbia. The lake is 135 km long, between 4 and 5 km wide, and has a surface area of 351 km . The lake's maximum depth is 232 meters near Grant Island (also called "Whiskey Island" or "Seagull Island" by locals). There is one other island known as Rattlesnake Island, much farther south by Squally Point. Some areas of the lake have up to 750 meters of glacial and post-glacial sediment fill which were deposited during the Pleistocene Epoch. The lake is composed of three basins, a larger North basin, a central or mid basin, and a Southern basin. The lake is drained by the Okanagan River, which exits the lake's south end in Penticton, after flowing over a small dam. Notable features of the Okanagan Valley include terraces which were formed due to the periodic lowering of the lake's predecessor, glacial Lake Penticton. These terraces are now used extensively for agriculture such as fruit cultivation.
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