The Rotten Calder is a scenic river flowing through the heart of Lanarkshire, Scotland, carving its way through a dramatic gorge landscape known as Calder Glen. This gorge forms the centerpiece of Calderglen Country Park, which borders the eastern edge of East Kilbride. The river is characterized by steep gorge profiles, dense woodland, rocky precipices draped in ferns, mosses, and liverworts, and a remarkable series of waterfalls that punctuate its course. The riparian zone is rich with wildlife, including European otter, roe deer, European green woodpecker, common buzzard, grey heron, grey wagtail, and the white-throated dipper — all indicators of a healthy, well-oxygenated river system. The Rotten Calder ultimately flows into the River Clyde at Turnlaw, opposite Daldowie, making it a tributary of one of Scotland's most historically significant river systems.