The Abertay Sands stretch eastwards into the North Sea for nearly 8 miles (13 km) from the mouth of the River Tay at Tayport in Fife. The Tentsmuir Sands extend southwards towards the mouth of the River Eden. The Arbroath-built Abertay light vessel was placed on station at the eastern end of Abertay Sands in 1877 and was for ten years the only manned lightship in Scottish waters.