Sauvie Island, in the U.S. state of Oregon, originally Wapato Island or Wappatoo Island, is the largest island along the Columbia River, at 26,000 acres (105 km²), and one of the largest river islands in the United States. It lies approximately ten miles northwest of downtown Portland, between the Columbia River to the east, the Multnomah Channel to the west, and the Willamette River to the south. Sturgeon Lake, in the north central part of the island, is the most prominent water feature. The land area is 84.82 km² (32.75 sq mi, or 20,959 acres), which is larger than Manhattan. Most of the island is in Multnomah County, but the northern third is in Columbia County. The Sauvie Island Bridge provides access across the Multnomah Channel from U.S.