The border runs along portions of rivers, including for 8 km (5.0 mi) along the large Rhine river. It also runs for about 100 km (62 mi) along the Meuse valley, although most of the time a few km to the east of the Meuse river rather than along it, before leaving the valley at the last portion of border to the border tripoint located at Vaalserberg about 3 km (1.9 mi) west of Aachen.