Broomlee Lough is an inland lake in Northumberland

Northumberland

Northumberland is the northernmost ceremonial county and a unitary district in North East England. For Eurostat purposes Northumberland is a NUTS 3 region and is one of three boroughs or unitary districts that comprise the "Northumberland and Tyne and Wear" NUTS 2 region...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 at the southern edge of Northumberland National Park

Northumberland National Park

Northumberland National Park is the northernmost national park in England. It covers an area of more than 1030 km² between the Scottish Border in the north to just south of Hadrian's Wall. It is one of the least populated and least visited of the National Parks...

. The lough lies immediately north of the course of Hadrian's Wall

Hadrian's Wall

Hadrian's Wall was a defensive fortification in Roman Britain. Begun in AD 122, during the rule of emperor Hadrian, it was the first of two fortifications built across Great Britain, the second being the Antonine Wall, lesser known of the two because its physical remains are less evident today.The...

. Old legends portray the lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 as a repository of hidden treasure.

Protected species

The White-clawed crayfish Austropotamobius pallipes is present in the Lough. The species is in decline in Europe, Great Britain, and in northeast England, and is the only crayfish native to the British Isles

British Isles

The British Isles are a group of islands off the northwest coast of continental Europe that include the islands of Great Britain and Ireland and over six thousand smaller isles. There are two sovereign states located on the islands: the United Kingdom of Great Britain and Northern Ireland and...

. It is likely that crayfish

Crayfish

Crayfish, crawfish, or crawdads – members of the superfamilies Astacoidea and Parastacoidea – are freshwater crustaceans resembling small lobsters, to which they are related...

 have never been widespread in Northumberland National Park

Northumberland National Park

Northumberland National Park is the northernmost national park in England. It covers an area of more than 1030 km² between the Scottish Border in the north to just south of Hadrian's Wall. It is one of the least populated and least visited of the National Parks...

as their preferred habitat of calcareous burns, rivers, and lakes is very limited.