Loch of Harray

The Loch of Harray is the largest loch of Mainland Orkney, Scotland and is named for the parish of Harray. It lies immediately north of the Loch of Stenness and is close to the World Heritage neolithic sites of the Stones of Stenness and Ring of Brodgar. In Old Norse its name was Heraðvatn.
The loch was surveyed on 21 August 1903 by Sir John Murray and later charted as part of the Bathymetrical Survey of Fresh-Water Lochs of Scotland 1897-1909. Murray observed that Loch of Harray is a freshwater loch, the largest in all Orkney with an area of approximately 3.75 square miles and volume of 951,000,000 cubic feet and that it is somewhat influenced by the tides in the Hoy Sound although there is little variation in its level. The loch is connected to the Loch of Stenness at the Bridge of Brodgar. The two lochs together cover an area of 19.3 square kilometres making the two combined the ninth largest loch in Scotland by area ). Murray recorded that despite there being an inlet allowing the free flow of water from the Loch of Stenness it has little impact on the biology of Harray and no seaweed was present, the water tasted fresh and normal freshwater plankton were seen.

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