Willamette Floodplain

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The Willamette Floodplain is the part of the Willamette River floodplain which was made a National Natural Landmark in May 1987. It is within the William L. Finley National Wildlife Refuge and located about 15 miles (24 km) south of Corvallis in Benton County, Oregon.

It is the largest remaining native unplowed example of bottomland interior valley grassland in the North Pacific Border natural region. It was classified as a natural landmark because such grassland and shrubland areas are exceedingly rare, with most having been cultivated or turned into pastureland.

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