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The eastern half of the state is occupied in the north by a westward extension of the Rocky Mountains, and in the centre and south by the north-western portion of the Columbia Plateau province.
The Okanogan Highlands, the Columbia plain, the E. slope of the Cascade Mountains and the S. portion of the Puget Sound Basin are drained b y the Columbia and its tributaries.
In the valleys of rivers which have overflowed their banks and on level bench lands there is considerable silt and vegetable loam mixed with glacial clay; but on the hills and ridges of western Washington the soil is almost wholly a glacial deposit consisting principally of clay but usually containing some sand and gravel.
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