Eynhallow Sound is a seaway lying between Mainland Orkney and the island of Rousay in the Orkney Islands, Scotland. The tidal indraught is "scarcely felt beyond a line joining Costa Head and the Reef of Quendale". An Iron Age broch, Gurness, has a strategic outlook over the Eynhallow Sound.
- United Kingdom Ordnance Survey Map Landranger Map, Orkney Mainland, 1:50,000 scale, 2002
- "Tide Tables for the British and Irish Ports", 1863
- C.Michael Hogan, Gurness, The Megalithic Portal, ed. A. Burnham, 2 December 2007 
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