The outlying areas of Houston, as well as the rest of Bellaire, the Memorial Villages, the airports and the city's suburbs and enclaves are outside the loop. Another ring road, Beltway 8 (also known simply as the "Beltway"), encircles the city another 5 miles (8 km) further out. A third, State Highway 99 or Grand Parkway, has begun construction roughly 10 miles (16 km) beyond the Beltway around the outer suburbs and currently extends from north of Interstate 10/U.S. Highway 90 east of Katy to Interstate 69/U.S. Highway 59 in Sugar Land.