Which firth separates Orkney from the Scottish mainland ?
Orkney tunnel Orkney tunnel The Orkney tunnel is a suggested undersea road tunnel between Orkney and Caithness on the Scottish Mainland. The expected length of it would be about 9–10 miles (15–16 km). The tunnel, if constructed, is assumed to make landfall on South Ronaldsay. In 2005, the tunnel was discussed, and then a total bill of £100 million was mentioned. There has not been so much discussion after 2005. There are also suggested plans to connect Orkney Mainland to Shapinsay. With recent developments of the renewables industry in the Pentland Firth, the idea of a tunnel has lost ground, though there
Mainland, Orkney archipelago. Ferry services operate between Orkney and the Scottish Mainland and Shetland on the following routes: Two services also connect Caithness, with South Ronaldsay, which is in turn connected to Mainland by road. Inter-island ferry services connect all the inhabited islands to Orkney Mainland, and are operated by Orkney Ferries, a company owned by Orkney Islands Council. Mainland has a great deal of marine life surrounding it, especially seabirds. Corncrakes can also be found in some parts. The Loch of Harray can host up to 10,000 wintering duck and is important for pochard. There are few wild land mammals although