| Tomburg | |
|---|---|
| Rheinbach-Wormersdorf | |
 Ruins of the Tomburg on the hill of Tomberg | |
  Tomburg | |
| Coordinates | 50°35′44.9″N 6°58′25.49″E / 50.595806°N 6.9737472°E |
| Type | Hill castle |
| Code | DE-NW |
| Height | 316 m above sea level (NN) |
| Site information | |
| Condition | The well and remains of the keep are still present |
| Site history | |
| Built | c. 900 |
| Garrison information | |
| Occupants | Noblemen, counts, robber barons |
The Tomburg is a castle ruin near Wormersdorf, a village in the municipality of Rheinbach near the German city of Bonn. It is located in a small nature reserve that contains a number of rare plant species, on the 316 m above sea level (NN) high Tomberg hill. The Tomberg is a relic of the Tertiary. Liquid lava rose up in a volcano; erosion has since removed the outer layers and left a basalt dome.