According to the U.S. Census Bureau, the county has a total area of 1,920 square miles (5,000 km2), of which 1,731 square miles (4,480 km2) is land and 189 square miles (490 km2) (9.8%) is water. It is noted for its broad, fertile valley of the Skagit River, a center for cultivation of tulips and strawberries.