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Marsdiep Inner Tidal Basin maps inner Marsdiep-side channels and tidal flats at an angler-useful scale, using the clipped official Rijkswaterstaat waterbody and gridded bathymetry rather than a modeled basin. The water tops out around 115 ft. The depth chart comes from Rijkswaterstaat bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Below is the species-by-species picture, pulled from the same data the map uses.
The outline encloses 61,187 acres, worked by 64.9 miles of shoreline. A middling shoreline index (1.9) gives it some bays to work without being a maze. Littoral water — the productive band under ~15 ft — makes up 29% of this chart. End to end it runs roughly 18.1 mi, about 12.5 mi across. Its nearest charted neighbour, Den Helder–Harlingen Wadden Coast, is 5 mi to the south.
Vis- en dieptekaart van Marsdiep Inner Tidal Basin, Nederland: gemeten dieptelijnen (Rijkswaterstaat) tot 35 m, met visstekken voor haring, bot. De dieptelijnen zijn berekend uit gemeten bodemhoogten van Rijkswaterstaat en het officiële lokale streefpeil (NAP). Gebruik de kaart als visgids, nooit voor navigatie.
The roster combines Wadden Sea station records and long-running regional monitoring, filtered to this saltwater habitat. It does not imply equal abundance across a tidal basin. The roster may combine exact-water monitoring with habitat-filtered official regional evidence; it does not imply that every species is equally abundant throughout the mapped section.
| Species | Evidence basis | Count / date |
|---|---|---|
| Haring (Atlantic Herring) | coastal monitoring | — |
| Bot (European Flounder) | coastal monitoring | — |
| Schol (European Plaice) | coastal monitoring | — |
| Tong (Common Sole) | coastal monitoring | — |
| Wijting (Whiting) | coastal monitoring | — |
| Zeebaars (European Seabass) | coastal monitoring | — |
| Spiering (European Smelt) | coastal monitoring | — |
| Paling (European Eel) | coastal monitoring | — |
Official species-evidence source.
When the water first warms, atlantic herring slide up into 5 to 25 ft. By summer they slide out to 15 to 50 ft, and by winter most fish are in 20 to 60 ft. If you only fish one area, make it RWS bathymetry-derived fishing zone: a drop-off around 51 ft that scores good in summer. In summer the feeding windows fall in early morning and the evening. Keep a herring feather rig or a small silver jig rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | open water | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | RWS bathymetry-derived fishing zone (51 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | open water | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | RWS bathymetry-derived fishing zone (51 ft) | Small silver jig, Sparse feather rig |
The spring pattern is a shallow one: european flounder in 5 to 25 ft. As the season builds they drop to 6 to 35 ft, wintering in 15 to 50 ft. Top water on the chart: RWS bathymetry-derived fishing zone, a feeding flat in the 40 ft range, good in fall. Time it for early morning and the evening. Summer baits: a bottom jig with spinner blade gets it done.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dusk | open water | Small bucktail dragged on bottom |
| Summer | 6 to 35 ft | dawn & dusk | RWS bathymetry-derived fishing zone (40 ft) | Bottom jig with spinner blade |
| Fall | 8 to 40 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Compact bottom jig |
| Winter | 15 to 50 ft | midday | RWS bathymetry-derived fishing zone (51 ft) | Small bottom jig |
Early season european plaice use the shallows, holding in 8 to 35 ft. Expect a summer slide to 6 to 40 ft, then a winter hold in 25 to 80 ft. Put RWS bathymetry-derived fishing zone first on the milk run — a feeding flat near 40 ft that grades prime for summer. In summer the feeding windows fall in early morning and the evening. Tie on a light spooned bottom rig or a beaded trace and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 8 to 35 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Beaded flowing trace |
| Summer | 6 to 40 ft | dawn & dusk | RWS bathymetry-derived fishing zone (40 ft) | Light spooned bottom rig, Beaded trace |
| Fall | 10 to 50 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Beaded bottom trace |
| Winter | 25 to 80 ft | midday | open water |
In spring, common sole run shallow here, mostly 6 to 30 ft. Summer keeps them at 3 to 30 ft, and they winter in 20 to 70 ft. Fall common sole concentrate at RWS bathymetry-derived fishing zone, a good-rated feeding flat around 40 ft. Fish it in the evening and you'll meet the bite. You won't need more than a light rolling-lead rig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 6 to 30 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Tiny bottom jig |
| Summer | 3 to 30 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Light rolling-lead rig |
| Fall | 8 to 40 ft | dusk | RWS bathymetry-derived fishing zone (40 ft) | Compact bottom jig |
| Winter | 20 to 70 ft | night | open water |
Early season whiting use the shallows, holding in 15 to 55 ft. Expect a summer slide to 20 to 70 ft, then a winter hold in 15 to 70 ft. In summer the feeding windows fall in early morning. Tie on a small vertical jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 55 ft | dawn & dusk | open water | Small silver jig, Two-hook feather rig |
| Summer | 20 to 70 ft | dawn | open water | Small vertical jig |
| Fall | 10 to 60 ft | dusk | open water | Small silver jig, Sparse feather rig |
| Winter | 15 to 70 ft | dusk | open water | Compact vertical jig |
When the water first warms, european seabass slide up into 3 to 25 ft. By summer they slide out to 2 to 30 ft, and by winter most fish are in 10 to 55 ft. In summer the feeding windows fall in early morning and the evening. Keep a surface lure or a paddle-tail soft plastic rigged through the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | open water | Paddle-tail soft plastic, Shallow minnow plug |
| Summer | 2 to 30 ft | dawn & dusk | open water | Surface lure, Paddle-tail soft plastic |
| Fall | 4 to 40 ft | dawn & dusk | open water | Slim metal lure, Minnow plug |
| Winter | 10 to 55 ft | midday | open water | Slow soft-plastic shad, Suspending minnow |
Marsdiep Inner Tidal Basin also holds european smelt (25 to 70 ft in summer), european eel (6 to 28 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Count 4 structure marks on this chart. The deepest, RWS bathymetry-derived fishing zone, sits near 100 ft.
Access data: Rijkswaterstaat Fairway Information Services. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Netherlands waters are set by the Netherlands Enterprise Agency (RVO — recreational saltwater fishing) — and special regulations can apply to Marsdiep Inner Tidal Basin specifically, so confirm the current rules before you fish.
Check the official Netherlands fishing regulations →
Marsdiep Inner Tidal Basin is about 115 ft (35 m) deep at its deepest point. The depth chart comes from Rijkswaterstaat bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Official coastal monitoring from Wageningen Marine Research — Dutch Wadden Sea monitoring informs the atlantic herring, european flounder, european plaice, common sole, whiting, european seabass, european smelt, european eel roster for Marsdiep Inner Tidal Basin. The mixed roster combines exact-water records where available with habitat-filtered regional evidence; not every species is documented at this exact water, and it is not a promise of equal abundance or a catch on a particular trip.
RWS bathymetry-derived fishing zone is the top-rated area: a feeding flat in about 40 ft of water that rates prime for european plaice in summer. The map above holds the full rated-spot list for every 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 Inner Tidal Basin is regulated by the Netherlands Enterprise Agency (RVO — recreational saltwater fishing). Check the official Netherlands regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Den Helder–Harlingen Wadden Coast 5 mi · North Holland Coast 9 mi · Vlie Inner Tidal Basin 10 mi · Texel Coast 11 mi · Marsdiep Outer Tidal Basin 13 mi · Marsdiep Offshore 13 mi · North Holland Stable Coast 15 mi · Vlie Outer Tidal Basin 19 mi · Borndiep–Pinkegat West Inner 22 mi · Vlieland Coast 22 mi · De Geeuw (Hemelum) 24 mi · IJsselmeer 25 mi
See how Marsdiep Inner Tidal Basin stacks up: best atlantic herring lakes in Netherlands · best european flounder lakes in Netherlands · best european seabass lakes in Netherlands · best common sole lakes in Netherlands
Browse all Netherlands fishing maps. See every water on DepthScout. Bathymetry credit: Rijkswaterstaat measured bed elevations and official target water levels, 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.