England's largest reservoir by volume — 2,700 acres of cold, peat-stained water pressed against the Scottish border. The low-nutrient character means the fish rely heavily on terrestrials blown in from the surrounding moorland, which is why almost everything that matters at Kielder happens within a long cast of the bank. Open-water boat drifts are rarely worth the fuel unless the surface is flat calm. The productive ground shifts with the wind: Plashetts holds the most natural feeding all year and draws the bigger fish; Whickhope Anchorage is binary — when the wind piles in, it fills with fish, and when the wind reverses, they leave. A wind that has held in one quadrant for three or four days is the highest-confidence signal the water produces, stacking trout progressively into the windward end until conditions change.

• Reservoir
• Peat