Colinton Dell is a steep-sided gorge and wildlife refuge on the Water of Leith, just north of the old village of Colinton. It extends from Colinton Parish Church towards Slateford along the Water of Leith Walkway and has an area of 10 ha (25 acres). The Dell includes mature and ancient mixed woodland and the protection afforded by the high banks and thick undergrowth makes it a natural habitat for wildlife, including numerous bird species and amphibians, voles, weasels, stoats and occasionally roe deer.
Today walkways and a cycle path take visitors to the ruined Redhall Mill and past Kate's Mill, where paper for the Bank of Scotland's first banknotes is said to have been made.
