Eynhallow Sound
Encyclopedia
Eynhallow Sound is a seaway lying between Mainland Orkney and the island of Rousay
Rousay
Rousay is a small, hilly island about north of Orkney's Mainland, off the north coast of Scotland, and has been nicknamed "the Egypt of the north", due to its tremendous archaeological diversity and importance....

 in the Orkney Islands
Orkney Islands
Orkney also known as the Orkney Islands , is an archipelago in northern Scotland, situated north of the coast of Caithness...

, Scotland
Scotland
Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

. The tidal indraught is "scarcely felt beyond a line joining Costa Head
Costa Head
Costa Head is a prominent headland on Eynhallow Sound on the northwestern coast of the Orkney Mainland, Scotland. The tidal indraught of Eynhallow Sound is "scarcely felt beyond a line joining Costa Head and the Reef of Quendale". To the east is the Point of Hellia on which is located the Broch...

 and the Reef of Quendale". An Iron Age
Iron Age
The Iron Age is the archaeological period generally occurring after the Bronze Age, marked by the prevalent use of iron. The early period of the age is characterized by the widespread use of iron or steel. The adoption of such material coincided with other changes in society, including differing...

 broch, Gurness, has a strategic outlook over the Eynhallow Sound.
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