The border between the countries of France and the United Kingdom in Europe is a maritime border that stretches along the Channel, the North Sea and the Atlantic Ocean, the Channel Tunnel links the two countries underground and is defined as a 'Land Frontier', and not widely recognised as a Land Border. It is defined by several international arbitrations from 1977, 1978, 1982, 1988 and 1991 for the maritime border and by the Treaty of Canterbury (1986) for the channel tunnel.