The geology gives it a character quite unlike most Scottish trout water: clearer, slightly alkaline, with better fly hatches and better-conditioned trout than the typical peat-stained Borders river. The Haddington and District Angling Association manages the best of the fishing and issues day tickets. The Tyne holds good wild brown trout averaging around eight ounces with fish to a pound and a half regularly caught, plus runs of sea trout and a few autumn salmon. It fishes in the dry-fly style through the classic hatches of May and June, the evening rise in high summer can be exceptional, and the lower reaches below East Linton take sea trout from July. A civilised river in civilised country — a rare thing within an hour of Edinburgh.

• Limestone