Brownhills is located at on the edge of Cannock Chase and lies mostly at a height of approximately 150 metres (492 ft) above sea level, although there is a sharp incline to nearly 180 metres (590 ft) at the eastern end of the town. The highest point of Cannock Chase, standing at 244 metres (801 ft) above sea level, lies approximately from the town. Although a small river called Crane Brook flows slightly to the east of Brownhills, the only significant bodies of water in the area are human-made, namely the canal and the reservoir Chasewater, which lies to the north, between Brownhills and Cannock Chase. The reservoir was constructed in the 18th century and reshaped by reclamation schemes as recently as the 1970s.