The Gardens by the Bay is a urbannature park spanning 110 hectares (270 acres) within the Marina Bay district of the Central Region of Singapore, adjacent to the Marina Reservoir. The park consists of three waterfront gardens: Bay South Garden (in Marina South), Bay East Garden (in Marina East) and Bay Central Garden (in Downtown Core and Kallang). The largest of the gardens is the Bay South Garden at 54 hectares (130 acres) designed by Grant Associates. Its Flower Dome is the largest glass greenhouse in the world.