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At 16,000 square miles the Puget Sound Basin, between the Cascade and Olympic mountains
in Northwest Washington, is the second largest estuary in the United States. Twenty
percent of the area is land, with a diversity of farms, forests, parks, small towns,
and busy cities. The remainder is freshwater, estuarine, and marine waters; over 20
major river systems and their tributary creeks drain mountain
elevations of 7,000 feet or more and drop to sea level within 50 to 70 miles.
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