Act on protection of external area in Tøndermarsken (No. 928 of 2009).
The Act applies to Tøndermarsken area and aims to protect the outer borders and the lower part of watercourse Vidå and establish it as a conservation area of national and international interest. Construction, fishing, hunting and planting of trees and plants are not permitted. Dyke systems are applied to watercourses for water supply.