The Gardens by the Bay (GBTB) is an urban park spanning 105 hectares in 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 with the Founders' Memorial in Marina East and Bay Central Garden in the Downtown Core and Kallang. The largest of the gardens is the Bay South Garden at 54 hectares designed by Grant Associates. Its Flower Dome is the largest glass greenhouse in the world.