The Dronne is the great under-the-radar French wild trout river, and anyone who has spent time on it in spring understands immediately why. It rises on the western flank of the Massif Central, runs west through Brantôme and Ribérac and the heart of the Périgord, and gathers its water less from rainfall than from the Jurassic limestone aquifer that buffers the whole catchment. The result is a river that runs clear and stable almost year-round, with wild brown trout populations that are the envy of most of Europe and nearly invisible to the fishing press because nobody writes about it in English. Guy Plas wrote about the Dronne. Every serious French fly fisher in the south-west knows it. The beats around Brantôme — the famous 'Venice of the Périgord' — hold good wild trout that rise freely to small olives, caddis, and terrestrials through spring and summer. The hatches are honest without being spectacular: Baetis from late March, olives through April and May, caddis building from May, and enough terrestrial opportunity in June and July to keep the dry fly busy. The groundwater buffering means the river holds condition through dry spells, though it will warm noticeably in prolonged summer heat. Fish it carefully, respect the wild stock, and treat it as the find that it is. The Dronne has been quietly producing great fishing for decades while the rest of the world was queueing for the Test.

• Limestone