Installation | Function | Location | Elevations (from– to) | Age period |
Gihon Spring | Sourced from a karstic aquifer | NE Jerusalem | ~635 m | Quarter- nary |
Upper Tunnel (UT) | Subterranean passage to the lower level water installations around the Gihon Spring | Entrance beneath MBII Stepped Wall | ~661.91 m till 647.2 m at WS | MBII |