St Helen's Pool
St Helen's Pool is a stretch of water amongst the Isles of Scilly, Cornwall, lying between three uninhabited islands of the group; St Helen's, Teän and Northwethal.
In the days when St Helen's had an inhabited monastic hermitage, it was a place of pilgrimage, and St Helen's Pool provided a sheltered anchorage for shipping.
Tresco lies just to the west, and the water is overlooked and guarded by the Old Blockhouse, the fort at Old Grimsby Harbour on Tresco.
This is still a sheltered water though though it does not keep out the Atlantic swells at high water.
There is evidence to show that during the later Middle Ages, the monks of Tresco may have collected tolls from ships for anchorage in St Helen's Pool, as it is considered that it was the main harbour of the islands in mediæval times.
