Viewed from the Cleveland Way, between Hutton Moor and Codhill Heights, Codhill Slack is a shallow boggy valley which drains into the River Esk and empties into the North Sea at Whitby. In the 13th century a document entitled “Cartularium Priory de Gyseburne” referred to it as Rivelingdale. It seems drier now than I remember with scattered scrub trees and with bracken encroaching, the rushes less intense with patches of Cottongrass. In the mid 19th century a leat or water race was built along Hutton Moor on the right to divert water to the ironstone mines at Hutton. This race can be still traced but I doubt if it’s still effective.