Once crucial to Glasgow’s industrial strength, the Clyde’s role has changed dramatically over time: for centuries workers on days off went ‘doon the watter’; now, the river is used more for recreation than industry. This volume examines the geography and history of the Clyde through a selection of 108 maps ranging from a 17th-century version of Ptolemy’s Insulae Albion et Hibernia to Russian maps of Glasgow and the lower Clyde dating from the Cold War, and 21st-century tourists’ guides.