The Allen is a tributary of the Stour running through the Crichel Estate in Dorset — a small chalk stream of exceptional water quality and habitat, with classic ranunculus, gravel runs, and stable flows. Crichel House manages most of the upper-river beats; lower river around Wimborne Minster has limited day-ticket access. Wild brown trout, technical chalk-stream conditions on a smaller scale than the Hampshire chalks.
- Chalk