Formed by damming a river valley in Somme, le Grand Marais is a small public reservoir covering 11 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.
For UK carp anglers, night fishing at le Grand Marais is allowed: Long-Le-Catelet (Zones). Regarding boats: Bank fishing only. Overnight bivouac camping is authorised, ideal for multi-day carp sessions.
le Grand Marais is just 74 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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le Grand Marais 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 la Somme) before fishing. French fishing regulations can change seasonally.
Somme 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.
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