Great Gibraltar Sand Dune | |
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  Great Gibraltar Sand Dune Location of the Great Sand Dune within Gibraltar. | |
| Coordinates: 36°08′03″N 5°20′36″W / 36.134166°N 5.343221°W | |
| Age | Pleistocene |
| Topo map | OS Gibraltar |
The Great Gibraltar Sand Dune is an ancient sand dune in the British Overseas Territory of Gibraltar. It forms part of the Upper Rock Nature Reserve and dominates the eastern cliffs of the Rock of Gibraltar. It was once used to capture rainwater which was contained in underground tanks within the Rock to satisfy the population's potable water needs.