| Fortification towers | Rock walls with cyclopean masonry. Protected access to all GS installations | Encloses MBII installations |
| MBII |
| Rock-cut Pool | Main reservoir for Eastern Hill (east) Jerusalem. Tunnel III entered the pool close to its bottom at 637 m elevation. | ~50 m SE of the spring | Floor of pool at 637 m | MBII |
| Channel II (Siloam Channel) | A near- surface rock-cut channel which carried water from the Gihon Spring into the Siloam Pool in southeast Jerusalem | Near-surface tunnel cut along Kidron Valley western flank | North entrance at 637.4 m | MBII |
| Tunnel III | Water conduit connecting Channel II with the Rock-cut Pool. | Branching from Channel II west | ~637.3 m | MBII |
| Channel VI | Main water conduit from the GS into the WS cave and Hezekiah’s Tunnel | GS area | ~635 m | IA II |
| Lower Tunnel (LT) | Deepened segment of UT, intersects Warren’s Shaft near its bottom termination | Connected with and directly beneath the Upper Tunnel | Bottoms at 647.2 m (at top of WS) | IA II |
| Warren’s Shaft (WS) | Natural, vertical karstic dissolution shaft. Used to draw water from karstic cave beneath it during IA II |
| Top 647.9 Bottom 634.9 m | IA II |
| Warren’s Shaft cave | Karstic cave beneath Warren’s Shaft. Water- fed via Channel VI |
| 632.12 (Cave floor) | Quarternary |
| Hezekiah’s Tunnel (HT) | Subterranean aqueduct. HT provided secondary access and a secure supply of water to SE Jerusalem. |
| Entrance at ~635 m | ~701 BCE |
| Sluice gate | Controled water level in HT aqueduct | 71 m from S exit | ~634.7 m | IA II |
| Siloam pool | Alternate water source for the Lower City. Acted as ritual pool since IA II |
| ~ 605 m | MB II & later |