The Tiefwasserreede (lit.
'deep water anchorage') is an exclave of Germany's territorial waters in the German Bight, used as a roadstead for shipping waiting for access to the Port of Hamburg, Ports of Bremen and other North Sea ports. The exclave lies around 30 kilometres (19 miles; 16 nautical miles) west of Heligoland, outside the 12 mile limit that usually defines territorial waters, but remains German territory under Article 12 of the United Nations Convention on the Law of the Sea which makes an exception for roadsteads. It legally forms part of the state of Lower Saxony and is completely surrounded by the German exclusive economic zone.[1]