Kielder Water is a large man-made reservoir in Northumberland in North East England. It is the largest artificial lake in the United Kingdom by capacity of water and it is surrounded by Kielder Forest, one of the biggest man-made woodlands in Europe. The scheme was planned in the late 1960s to satisfy an expected rise in demand for water to support a booming UK industrial economy.

Kielder Forest is a large forestry plantation in Northumberland, England, surrounding Kielder village and the Kielder Water reservoir. It is the largest man-made woodland in England with three-quarters of its 250 square miles (650 km2) covered by forest. The majority of the forest lies within Kielder Water and Forest Park, with the southern tip known as Wark Forest lying within Northumberland National Park. The forest is next to the England - Scotland border.