Hill castles may be further subdivided depending on their situation into the following: * Hilltop castle (Gipfelburg), that stands on the summit of a hill with steep drops on all sides. A special type is the rock castle or Felsenburg. * Ridge castle (Kammburg), that is built on the crest of a ridge. * Hillside castle (Hangburg), that is built on the side of a hill and thus is dominated by rising ground on one side. * Spur castle (Spornburg), that is built on a hill spur surrounded by steep terrain on three sides and thus only needs to be defended on the one remaining side.