Natura 2000 Site no. 65
The fiord itself consists of three basins named Bøvling or Yder Fjord, Mellem Fjord and Felsted Kog and covers a total of 6.500 ha. Together with adjacent meadows and wetlands the area of 10.967 ha has been designated as a Ramsar site, Special Protection Area (EU Birds Directive) and Special Area of Conservation (EU Habitats directive) which together form Natura 2000 site no. 65. This designation is based on the occurrence of 23 bird species, 6 species of plants, fish or mammals and 7 different nature types amongst which there is 5.930 ha of coastal lagoon – a habitat type of special priority in the EU. Of the 23 species of birds, 13 species occur as migratory birds in numbers that are considered of international importance.