Jonell map and photo (IMAGE) PNAS Nexus Caption Mills (circles in left) were rarely sited above 300 meters elevation or on land broadly classified as moor, peat, fen or marsh (green area in left; upland landscape in right). The very few sites above 300 meters were commonly associated with mining activities. The more than 90% of mills sited below 200 meters elevation took advantage of the generally greater and more regular waterpower available there and maintained stronger links with populated villages surrounded by better transport networks. Photograph of the Derwent Moors was taken near Edale, Derbyshire. Credit Tara N Jonell. Usage Restrictions None. Higher resolution version available on request. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.