Is éard is corcach (nó riasc[1]) ann ná réigiún talún atá báite an t-am ar fad agus fásra tiubh giolcach nó crann ann (Béarla: marsh). Tá corcacha mangróibh coitianta ar feadh inbhir aibhneacha sna trópaicí is na fo-thrópaicí. Sa tréimhse Charbónmhar bhíodh corcacha muirí an-choitianta, agus is iontu a cruthaíodh fosuithe guail an lae inniu.[2]
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Wye_Marsh_panorama1.jpg/640px-Wye_Marsh_panorama1.jpg)
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