The city is largely low-lying, but with a few hilly areas. Wentwood is above sea level. Areas in the south and east of the city tend to be flat and fertile with some housing estates and industrial areas reclaimed from marshland. Areas near the banks of the River Usk, such as Caerleon, are also low-lying. The eastern outskirts of the city are characterised by the gently rolling hills of the Vale of Usk and Christchurch has panoramic views of the Vale of Usk and the Bristol Channel. Ridgeway at Allt-yr-yn also has good views of the surrounding areas and Bristol Channel. Brynglas has views over the city centre and Twmbarlwm to the west. The suburbs of the city have grown outwards from the inner-city, mostly near the main roads, giving the suburban sprawl of the city an irregular shape. The urban area is continuing to expand rapidly with new housing estates continuing to be built.