Atlantic Ocean, United Kingdom, west coast of Scotland, Northern Loch Linnhe (geocoordinates not provided, estimated with gazetteer to be approximately lat. 56.68º, long. -5.29º); 11-22 m, in 18% sand, 80% silt and 1% clay, to 46% sand, 47% silt and 6% clay, salinity between 31 and 32‰, temperature between 6 and 13ºC