| Completed? | ❌ |
| DoBIH Number | 400 |
| Height Rank | 118 of 222 |
| Name | An Dun |
| Meaning | the fort |
| County | Highland/Perth and Kinross |
| Scratch Region | Drumochter Hills |
| SMC Region | 05: Loch Ericht to Drumochter |
| RHB/TACit Region | 05B: Loch Ericht to Glen Tromie & Glen Garry |
| Summit Feature | tiny cairn |
| Observations | 29m NNW of main cairn and 0.38m higher; same height as hill 399 to within 0.03m |
| Height | 827.4m / 2715ft |
| Drop | 232m |
| Latitude / Longitude | 56° 53′ 41″ N, 4° 06′ 31″ W |
| Grid Ref | NN 71652 80133 |
| OS Map (1:50k) | 42 |
| OS Map (1:25k) | OL51W 394W |
| Links | Walkhighlands | OSMaps |