Roundhill Reservoir is one of two reservoirs in the valley of Pott Beck, a side valley of the River Burn which in turn flows into the River Ure at Masham.
Unlike neighbouring Leighton Reservoir, which is apparently used as a compensation reservoir for the River Ure, Roundhill Reservoir was built to supply water to Harrogate. An unusual monument to the surveying that was carried out for placing the pipeline is the tall sighting tower situated on Ilton Moor above the reservoir.
Whilst Leighton Reservoir lacks public rights of way, Roundhill Reservoir is slightly better served in this regard. A good track crosses the reservoir’s dam before climbing gradually up on to Arnagill Moor above the side valley of Arnagill. At the western end of the reservoir a path drops down from Low Ash Head Moor before climbing up Pott Moor High Road on the other side of the valley.