53°40′01″N 2°32′17″W / 53.667°N 2.538°W
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Black Brook in Lancashire has its source at Great Hill in the West Pennine Moors. The water is acidic due to a high level of peat in the uplands near to Round Loaf, giving the brook its brown colour. The young river was known as Warth Brook in olden Heapey. A feeder stream also known as Black Brook joins near Kittiwake Road - this short and weak water course commences at Eagle Tower. The jointed brook feeds Anglezarke Reservoir, and joins the River Yarrow in lowland Chorley at Yarrow Bridge.[1] The entire course of Black Brook and the River Yarrow fall within Chorley and its villages.