 Omak , situated in the foothills of the Okanogan Highlands in central Okanogan County , is part of the Okanogan Country region , extending into British Columbia . It also lies within the Inland Northwest , centered on Spokane , and the Columbia Plateau ecoregion near the Okanogan Drift Hills . The Okanogan River , a 115 @-@ mile ( 185 km ) tributary of the Columbia River , flows through the central portion of the city , and receives Omak Creek from the east just outside municipal boundaries . Known for its balancing Omak Rock , the 3 @,@ 244 @-@ acre ( 1 @,@ 313 ha ) Omak Lake — 950 feet ( 290 m ) above sea level — is the largest saline endorheic lake in Washington . The 80 @-@ acre ( 32 ha ) Crawfish Lake is located about 15 miles ( 24 km ) northeast of Omak at the border of the Colville Indian Reservation and Okanogan National Forest . The 1 @,@ 499 @,@ 023 @-@ acre ( 6 @,@ 066 @.@ 33 km2 ) forest comprises varied terrain and several mountain peaks . 
