Tyn Y Fron sits high on acidic ground in Gwynedd, fished for rainbows and browns, and it shares the character of all upland Welsh water — soft, peaty, honest, and entirely at the mercy of the weather. Acid catchments don't grow the dense insect life of a limestone lake, so the fish lean opportunist, which means a well-worked lure or a bright nymph often does more than a perfect imitation. That's no bad thing on a blustery upland afternoon when delicate presentation is a fantasy anyway. The good days are cool and overcast with a ripple riding the surface; the hard days are flat and glaring. The browns hold deep and play hard to get, as wild-streaked upland browns tend to. Dress for the weather and bring patience.

• Fishery
• Acidic