The Cham-Furth Depression has always been an important communication route between Bavaria and Bohemia. Cham Castle, built around 976, guarded the eastern border of the Empire. The Bavarian-Bohemian border of the vast area has remained highly disputed throughout the early modern period, which led to different negotiations and agreements between the kings of Bohemia and the dukes of Bavaria in 1564, 1580, and finally in 1764. Today the area is part of the Upper Bavarian Forest Nature Park.