Landscape occupies nearly 30 acres at Marina Bay Sands, 75 percent of which is public space and almost all of which is on structure. The half-mile-long Waterfront Promenade features a triple allée of Roystonia palms interspersed with informal groupings of large canopy trees—Khaya, Peitophorum, and Alstonia—a design that provides both scale and much-needed shade. Permeable pavement systems collect surface drainage and reduce runoff.