Much of Northwest Ohio was the Great Black Swamp until the mid-19th century when the swamp was drained and the land was reclaimed as fertile farmland. The largest center in the region, Toledo, is home to one of the largest remaining portions of the swamp at Pearson Metropark. Located on the banks of Lake Erie, Toledo's shipping history can be relived at the S.S. Willis B. Boyer, a former Great Lakes freightliner that has been transformed into a museum. The first presidential library and museum of the United States can be found in Fremont at the Rutherford B. Hayes Presidential Center, located on the former president's estate. Other attractions in this part of Ohio include the Allen County Museum in Lima, the African Safari Wildlife Park in Port Clinton, Bowling Green State University in Bowling Green and the Hancock Historical Museum in Findlay.