Roundhill Reservoir is situated near Leighton Reservoir

Leighton Reservoir

Leighton Reservoir is a reservoir which drains via the River Burn to the River Ure in North Yorkshire, England. It neighbours Roundhill Reservoir and is about west of Masham...

 in North Yorkshire

North Yorkshire

North Yorkshire is a non-metropolitan or shire county located in the Yorkshire and the Humber region of England, and a ceremonial county primarily in that region but partly in North East England. Created in 1974 by the Local Government Act 1972 it covers an area of , making it the largest...

, 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...

. It was constructed by Harrogate

Harrogate

Harrogate is a spa town in North Yorkshire, England. The town is a tourist destination and its visitor attractions include its spa waters, RHS Harlow Carr gardens, and Betty's Tea Rooms. From the town one can explore the nearby Yorkshire Dales national park. Harrogate originated in the 17th...

 Corporation early in the 20th century. Water from the reservoir is fed into Yorkshire Water

Yorkshire Water

Yorkshire Water is a water supply and treatment utility company servicing West Yorkshire, South Yorkshire, the East Riding of Yorkshire, part of North Lincolnshire, most of North Yorkshire and part of Derbyshire, in England. The company has its origins in the Yorkshire Water Authority, one of ten...

's grid.

Roundhill reservoir is overlooked by a strange stone tower. This is Carlesmoor sighting tower used to triangulate the end points of a water tunnel

Water tunnel (physical infrastructure)

Water tunnels are tunnels used to transport water to areas with large populations or agriculture. They are part of aqueducts.-See also:*Metropolitan Water District of Southern California*Moffat Tunnel...

 from the reservoir to Harrogate

Harrogate

Harrogate is a spa town in North Yorkshire, England. The town is a tourist destination and its visitor attractions include its spa waters, RHS Harlow Carr gardens, and Betty's Tea Rooms. From the town one can explore the nearby Yorkshire Dales national park. Harrogate originated in the 17th...

. It is one of several Colsterdale towers

Colsterdale towers

The Colsterdale towers are a number of interesting towers in and around Colsterdale, North Yorkshire, England.Visible from Roundhill Reservoir and Leighton Reservoir above Arnagill Crags is a stone sighting tower built over an aqueduct near a water pumping station...

.

Although not in Nidderdale

Nidderdale

Nidderdale is one of the Yorkshire Dales in North Yorkshire, England. It is the upper valley of the River Nidd, which flows south through the dale, forming several reservoirs including the Gouthwaite Reservoir, before turning east and eventually joining the River Ouse.The only town in the dale is...

, the reservoir is within the Nidderdale Area of Outstanding Natural Beauty

Area of Outstanding Natural Beauty

An Area of Outstanding Natural Beauty is an area of countryside considered to have significant landscape value in England, Wales or Northern Ireland, that has been specially designated by the Countryside Agency on behalf of the United Kingdom government; the Countryside Council for Wales on...

.