The National Bonsai Foundation (NBF) is a nonprofit organization that was created to sustain the National Bonsai and Penjing Museum. NBF also helps the United States National Arboretum showcase the arts of Bonsai and Penjing to the general public. The National Bonsai and Penjing Museum is located on the 446-acre (1.80 km2) campus of the US National Arboretum in northeast Washington, D.C. Each year over 200,000 people visit the museum. Distinguished national and international guests of various Federal Departments are also among the visitors.