Sauvie Island is in the U.S. state of Oregon, originally named as Wapato Island or Wappatoo Island. It is the largest island along the Columbia River, at 24,000 acres, 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. A large portion of the island is designated as the Sauvie Island Wildlife Area.