High Quality Content by WIKIPEDIA articles! Eday is one of the Orkney Islands, which are located to the north of the Scottish mainland in the United Kingdom. Eday is located in the North Isles of Orkney, and is about 15 miles (24 km) north of the main island of Orkney Mainland. With an area of 11 square miles (28 km2), Eday is the ninth largest of the Orkney Islands.