What is "seewald"

Seewald is a municipality in the Freudenstadt district in Baden-Württemberg in southern Germany. It lies in the Black Forest. The source of the river Nagold is situated in the municipality. There is a dam in the river near the village Erzgrube, forming the artificial lake Nagoldsee. Erzgrube lies above sea level. Other subdivisions lie between above sea level in the midst of the forests. 90% of the area is covered with forests.