Eynhallow Sound
From Wikishire
Eynhallow Sound is a sea channel amongst the Orkney islands, lying between Mainland, Orkney and the island of Rousay.
The tidal indraught in the Eynhallow Sound is "scarcely felt beyond a line joining Costa Head and the Reef of Quendale",[1] for which reason it is a useful seaway.
An Iron Age broch, Gurness, has a strategic outlook over the Eynhallow Sound.[2]
