The Farne Islands are a group of islands off the coast of Northumberland, England. There are between 15 and 20 islands depending on the state of the tide. They are scattered about 1½–4¾ miles (2.5–7.5 km) from the mainland, divided into two groups, the Inner Group and the Outer Group. The main islands in the Inner Group are Inner Farne, Knoxes Reef and the East and West Wideopens (all joined together on very low tides) and (somewhat separated) the Megstone; the main islands in the Outer Group are Staple Island, the Brownsman, North and South Wamses, Big Harcar and the Longstone. The two groups are separated by Staple Sound. The highest point, on Inner Farne, is 62 feet (19 metres) above mean sea level.