Grimwith Reservoir sits within the scenic Yorkshire Dales in North Yorkshire, England, positioned at an elevation of 308 metres (1,010 feet) above sea level. As Yorkshire Water's largest reservoir in terms of water storage, it holds an impressive 21,772,000 cubic metres of water across a surface area of 1.47 square kilometres. The reservoir is fed by several becks including Blea Beck, Gate Up Gill, and Grimwith Beck, with its outflow draining into the River Dibb. Located 1.5 miles east of Hebden and approximately 8 miles west of Pateley Bridge, the reservoir is accessible via the B6265 road and sits near the villages of Appletreewick, Burnsall, Hartlington, Hebden, and Skyreholme.