This walk is a grand circuit of Grassholme Reservoir starting from Middleton-in-Teesdale. Part of the Silver Challenge developed by the Upper Teesdale Tourism Network (UTTN). The Challenge Walks (www.teesdalechallengewalks.net) are a series of walks produced by the UTTN to help visitors and local people to explore this spectacular part of the North Pennines Area of Outstanding Natural Beauty and UNESCO Global Geopark. For detailed walk directions click the link below.