Entwistle resovoir

Turton and Entwistle Reservoir is a water reservoir in the village of Edgworth, Lancashire, England. The reservoir's existence is due to the Entwistle Dam. When constructed in 1832 the Entwistle Dam was the highest in Britain; it rises 108 feet from the base. The reservoir contains almost 750 thousand imperial gallons (roughly 3,400,000 litres) and, with the Wayoh Reservoir just below, satisfies around 50% of Bolton's need for drinking water.

Yarnsdale is a dale or valley in Lancashire. The name is derived from the heron or hern.It contains a small sandstone quarry, also known as Cadshaw Quarry at grid reference 706.178, situated to the north west of Turton and Entwistle Reservoir in the borough of Blackburn with Darwen. It is used mainly by rock climbers and hikers who use it as a short cut between Turton Moor and the reservoir, passing the Strawbury Duck Hotel, (known for Black Sheep bitter), at Entwistle.