Oronsay Priory

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If the tide is right, don't miss walking across the half-mile of cockleshell-strewn sand linking Colonsay to smaller Oronsay. Here you can explore the 14th-century ruins of one of Scotland's best-preserved medieval priories. There are two beautiful 15th-century stone crosses in the kirkyard, but the highlight is the collection of superb carved grave slabs in the Prior's House. The island is accessible on foot for about 1½ hours either side of low tide; there are tide tables at the ferry terminal and hotel.