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The Marsdiep was once a river (fluvium Maresdeop) which may have been a distributary of the Vlie. During the early Middle Ages this began to change as rising sea levels and storms started to eat away at the coastal areas which consisted mainly of peatlands. In this period the inlet was referred to as the Almere, indicating it was still more of a lake, but the mouth and size of the inlet were much widened in the 12th century and especially after a disastrous flood in 1282^[1] broke through the barrier dunes near Texel. The disaster marked the rise of Amsterdam on the southwestern end of the bay, since the seagoing traffic of the Baltic trade could now visit.^{[citation needed]}