The Columbia Bottom Conservation Area is a 4,256-acre (17.22 km2) conservation area located on the south side of the Missouri River at its confluence with the Mississippi River. The conservation area, which is located in eastern St. Louis County, Missouri, north of the city of St. Louis, is operated by the Missouri Department of Conservation. One key asset is 6.5-mile (10.5 km) of river frontage for boating, fishing, and birdwatching.