A predominantly intact, riverine poor fen. The vegetation is dominated by various species of sedge Carex, with some wet woodland. Part of the area is used for haymaking.
The density of Acrocephalus paludicola at this site is the highest known in Europe. Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (frequent).
BirdLife International (2020) Important Bird Areas factsheet: Yaselda. Downloaded from http://www.birdlife.org on 28/10/2020.