The Abraham Lincoln Memorial Garden is a self-governing 100-acre (0.4 km²) arboretum and network of recreated prairie savannahs owned by the city of Springfield, Illinois. The gardens are made up of two major units, the 63-acre Jensen section bordering Lake Springfield, and the newer 37-acre Prairie Pond section. As of April 2006, the Garden is maintained by a full-time staff of 4 men and women, supplemented by more than 150 volunteers and docents.