Wide swamps, deep morasses, tangled thickets, and wild, impassable forests were their prevailing features. Low-lying land is more fertile but also has morasses, inundations and miasmas. The Mississippi is skirted with lagoons, lakes and morasses from Ste. The Alde Feanen contains morasses, lakes, forests, peat and meadows. Many others escaped towards the forests, morasses, and tidal islands of the coast. Their main fortune was a result of their activities in impoldering morasses. Other variants on morasses, generally with added structure, have also appeared over the years.