The mountainous woodland of the Harz rises in the middle of the German-Polish plain. Plentifully supplied with waterways and numerous dams, it has become a reservoir for the surrounding regions. The highest point of the range, the Brocken (1 142m), was, according to legend, the site of Witches' Black Sabbaths, but it is now more popular with walking enthusiasts. Other points of interest are an old silver mine, Silberbergwerk Samson, the half-timbered houses of Goslar and Wernigerode as well as countless natural wonders such as the Bode Valley.