Regulation No. 153 on the protection of Jerndalsfjellet nature reserve, Advise municipality, Østfold.

The purpose of the Regulation is to preserve a fire field with soot timber (the natural regrowth) and an adjoining small affected area with spruce and pine forests. The area represents a particular habitat type in lowland below the marine limit of bedrock in Southeast Norway. The area has significance for biodiversity and the document's goal is to keep its conservation values ​​and possibly developing it. The natural reserve affects areas in the Advise municipality.