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Grassholm Island

Pembrokeshire islands

Grassholm Island is often described locally as the island that you may smell before you see. This is due to the fact that it is rather tiny, a mere 22 acres in size, yet home to over 80,000 gannets between April and October. The island is situated on the edge of the nutrient rich waters of the Celtic Deep  (10 nautical miles offshore), where tidal front activity results in the plankton blooms that makes it such a good foraging ground both for sea birds and marine mammals.