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| Marsdiep | |
|---|---|
 The Marsdiep | |
| Location | BetweenDen Helder andTexel,Netherlands |
| Coordinates | 52°59′05″N4°44′41″E / 52.98472°N 4.74472°E /52.98472; 4.74472 |
| Type | Tide-race |
| Basin countries | Netherlands |
| Islands | Texel |
| Location | |
 Interactive map of Marsdiep | |
TheMarsdiep is a deep tide race betweenDen Helder andTexel in the Netherlands, and running southwards between sandbanks. That gap connects theNorth Sea and theWaddenzee.
Around 1000 AD and before, much of the modern Waddenzee andIJsselmeer was land and the Marsdiep was an ordinary brook. An early form of its name is Maresdeop, a name probably related to modern Dutchmoerasdiep ("swamp deep"). During theAll Saints' Flood of 1170, the sea broke through the original dune barrier and created the channel.
TheMarsdiep was in theage of sail in English calledthe Texel, in distinction from the island of Texel.
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