Strangford Lough is the largest sea lough in the British Isles, covering an area from Angus Rock at its mouth on the Irish Sea, to the vast sand-flats at its northern end 20 miles away. It is one of only three designated Marine Nature Reserves in the United Kingdom. The wealth of wildlife, unrivalled in Europe, is complex, delicately balanced, dependent on tides, and include a wide variety of habitats found between the seabed and shoreline.