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10,846-acre river near Den Helder. The water tops out around 177 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Species by species, here's what the data says the year looks like.
Traced from the shoreline, Marsdiep Offshore runs 10,849 acres with 41.9 miles of edge, with a single island in the mix. With a shoreline index of 2.9, this water is all arms and coves — edge habitat well beyond its acreage. 44% of the surface is littoral (under ~15 ft) — cover, weeds and forage water. The basin spans about 9.5 mi end to end and 7.1 mi across at its widest. The nearest mapped water is Texel Coast, 6 mi to the east.
Vis- en dieptekaart van Marsdiep Offshore, Nederland: gemeten dieptelijnen (Rijkswaterstaat) tot 54 m, met visstekken voor haring, bot, geep. De dieptelijnen zijn berekend uit gemeten bodemhoogten van Rijkswaterstaat en het officiële lokale streefpeil (NAP). Gebruik de kaart als visgids, nooit voor navigatie.
Spring puts atlantic herring in skinny water — 5 to 25 ft is the zone. Warm water sends them out to 15 to 50 ft; cold water stacks them in 20 to 60 ft. Measured shallow feeding flat is the standout, a feeding flat at roughly 14 ft, rated good for spring atlantic herring. Plan around early morning and the evening in the warm months. A herring feather rig or a small silver jig covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | Measured shallow feeding flat (14 ft) | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | Measured deep-water holding area (177 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Measured deep-water holding area (177 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | Measured deep-water holding area (177 ft) | Small silver jig, Sparse feather rig |
Spring european flounder on Marsdiep Offshore hold shallow, usually 5 to 25 ft. They move out to 6 to 35 ft in summer and finish the year down in 15 to 50 ft. Put Measured shallow feeding flat first on the milk run — a feeding flat near 14 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a bottom jig with spinner blade.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dusk | Measured shallow feeding flat (14 ft) | Small bucktail dragged on bottom |
| Summer | 6 to 35 ft | dawn & dusk | Measured shallow feeding flat (31 ft) | Bottom jig with spinner blade |
| Fall | 8 to 40 ft | dusk | Measured shallow feeding flat (31 ft) | Compact bottom jig |
| Winter | 15 to 50 ft | midday | Measured shallow feeding flat (31 ft) | Small bottom jig |
Start shallow in spring: garfish sit in 1 to 15 ft that time of year. Warm water sends them out to 2 to 20 ft; cold water stacks them in 20 to 60 ft. Fish it in early morning and the evening and you'll meet the bite. Throw a slim casting spoon or a surface-skipping fly until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 1 to 15 ft | dawn & midday | open water | Slim silver spoon, Small inline spinner |
| Summer | 2 to 20 ft | dawn & dusk | open water | Slim casting spoon, Surface-skipping fly |
| Fall | 8 to 30 ft | dawn & dusk | open water | Weighted slim spoon, Small silver jig |
| Winter | 20 to 60 ft | midday | open water |
Marsdiep Offshore carries 7 mapped structure features, topping out (or rather bottoming out) at Measured deep-water holding area, about 177 ft down.
Season dates, license requirements, and size and bag limits for Netherlands waters are set by the Sportvisserij Nederland (zeevissen — sea angling rules) — and special regulations can apply to Marsdiep Offshore specifically, so confirm the current rules before you fish.
Check the official Netherlands fishing regulations →
Marsdiep Offshore is about 177 ft (54 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target atlantic herring, european flounder, garfish on Marsdiep Offshore. This isn't a survey of the water — none is published for it — but an informed estimate from the species common to the region, narrowed by this water's depth, size and each species' range.
Measured shallow feeding flat is the top-rated area: a feeding flat in about 14 ft of water that rates prime for european flounder in spring. The interactive chart above rates every spot for each species and season.
For atlantic herring, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Marsdiep Offshore is regulated by the Sportvisserij Nederland (zeevissen — sea angling rules). Check the official Netherlands regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Texel Coast 6 mi · Waddenzee West 12 mi · North Holland Coast 14 mi · Vlieland Coast 19 mi · North Holland Stable Coast 20 mi · Waddenzee Mainland Coast West 25 mi · Vlie Offshore 27 mi · De Geeuw (Hemelum) 37 mi · Terschelling Coast 37 mi · Morra 37 mi · Oudegaasterbrekken 37 mi · Terschelling Stable Coast 37 mi
See how Marsdiep Offshore stacks up: best atlantic herring lakes in Netherlands · best european flounder lakes in Netherlands · best garfish lakes in Netherlands
Browse all Netherlands fishing maps or see every water on DepthScout. Bathymetry credit: Rijkswaterstaat coastal and vaklodingen surveys, CC0. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.