Formed by damming a river valley in Oise, Plan d'Eau 4 du Marais de Rosoy is a small public reservoir covering 12 hectares and one of the more significant fisheries in Hauts-de-France. Species include Carp, Pike, Perch and Tench — with carp fishing the primary attraction for travelling anglers.
Night fishing is not permitted at Plan d'Eau 4 du Marais de Rosoy, so plan accordingly. Regarding boats: Bank fishing only. Overnight bivouac camping is authorised, ideal for multi-day carp sessions.
Plan d'Eau 4 du Marais de Rosoy is just 115 miles from Calais — one of the most accessible venues in northern France for UK day-trippers and weekend anglers. Hauts-de-France is the closest French region to the UK — ideal for shorter fishing trips without a long drive.
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Plan d'Eau 4 du Marais de Rosoy holds carp, pike, perch, tench. Carp fishing is the primary draw for visiting UK anglers, with fish present throughout the venue.
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2nd Category water. Carp/coarse: open all year. Pike: 25 Apr 2026–31 Jan 2027 (closed Feb–Apr). Zander/Perch/Catfish: all year. Pike season as above.
Always verify current rules with the local AAPPMA (AAPPMA locale de l'Oise) before fishing. French fishing regulations can change seasonally.
Oise is home to numerous fishing venues accessible to UK anglers. PiscaMaps covers lakes, reservoirs, rivers and canals across all Hauts-de-France departments, with full rules, species and access information for each venue.
Other public fishing venues near Plan d'Eau 4 du Marais de Rosoy on PiscaMaps: