Lihou, Tidal island in Saint Peter's, Guernsey
Lihou is a tidal island off Guernsey that connects to the mainland through a 760-meter causeway when the tide recedes. The 38-acre land reveals a mixed landscape of rock, grass, and coastal plants spread across its surface.
A priory dedicated to St Mary was built here in the 12th century and remains the largest religious structure within the Bailiwick of Guernsey. This medieval foundation shows how early the island served as a place of worship and settlement.
Seaweed harvesting for fertilizer has been practiced here for generations, reflecting traditional agricultural knowledge passed down through Channel Islands families. This skill shaped how local communities understood and used the island's natural resources.
Access depends on tidal schedules, so check a tide calendar before planning a visit as the causeway is only passable at low tide. The crossing takes about 20 minutes and calls for sturdy footwear, with attention to water levels that shift throughout the day.
This location holds Ramsar wetland protection status and hosts over 200 seaweed species alongside many water birds using it as natural habitat. This conservation designation makes it a site of ecological importance and bird watching opportunity in the region.
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