Marshlands have many of the same qualities as river deltas.
Marshlands have been particularly vulnerable to drainage and ditching in connection with forestry and agriculture. Wetlands and marshes are considered as important buffers against river flooding. Clear-cutting of forested areas, including forest close to rivers, cultivation all the way down to the river bed combined with ditching and drainage, may at least partly explain the serious river floodings that we have experienced during the recent years.