Consthum, Fuhren, Hoscheid and Munshausen joined, and by 1998 SIVOR had been expanded to include the communities of Clervaux, Ulflingen and Wilwerwiltz to 13 communities. In 1994, the foundation of the nature park was tackled on the basis of the nature park law of 1993 (loi du 10 août 1993 relative aux parcs naturels). The concept was developed by 2003, and the ordinance of the nature park came into force on June 9, 2005. The smaller number of participating communities today is based on the one hand on community mergers in 2006, when Bastendorf and Fuhren merged to form the new community of Tandel, while at the same time Wilwerwiltz and Kautenbach merged to form the community of Kiischpelt. On the other hand, the municipality of Weiswampach did not join the nature park. Further church mergers in 2011 led to a further reduction in the number of member churches to 7 currently. See also Clervaux References Nature parks in Luxembourg Ardennes