Geography
The valley is traversed by the Tualatin River and is bordered on the north and east by the Tualatin Mountains, a spur of the Northern Oregon Coast Range. The later range also comprises the valley's western border. To the south lie the Chehalem Mountains, separating the region from the main Willamette Valley. The Tualatin River flows mainly from the west to the east and leaves the valley in the southeast at West Linn in Clackamas County. Tualatin Valley's geographical center is located southeast of Hillsboro, and the general elevation of the valley is 180 feet (55 m) above sea-level.
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