Mill Ends Park (sometimes called Mill's End Park) is a small urban park. It is located in the median strip of SW Naito Parkway, approaching esplanade along the Willamentte Rivera near SW Taylor Street in downtown Portland, Oregon, United States. The park is a small circle across. It has a total area of . It is the smallest park in the world. This fact was included in the "Guinness Book of Records" in 1971.