||The Rondane mountain region, in South-East Norway, is very popular for recreational purposes. The region is also the habitat for 4500 wild reindeer (Rangifer tarandus tarandus). The reindeer are hunted in controlled forms as part of the area management and harvesting of nature. This rural region suffers from decreasing population figures, reduced agricultural activity and declining economic activity in general. Boosting economic activity by increasing tourism, especially in second homes, is thought to be one way of mitigating this decline. Increased recreational activity may however negatively influence a sustainable development of the wild reindeer herd. In order to manage this possibly conflicting interest, local and regional authorities in 1991 set up a regional development plan, covering relevant parts of 14 municipalities in the Hedmark and Oppland counties. Research indicates that taken actions to some extent have managed to balance increase in tourism and protect vital space for wild reindeer. Still, the exact localization of existing and new second homes, and hence the development of new interventions, was until some years ago, not possible to analyse at an aggregated level. Such monitoring is important. A Norwegian real estate register, mapping the exact geographic position of buildings and their year of construction, has however become an important means for such monitoring. By the end of 2005 there were about 18,000 second homes mapped in the region. Increased GIS knowledge has now made it possible to develop detailed analysis of localization of second homes, i.e. distance from the wild reindeer core area, and analyse the development by statistic tools. This is a breakthrough and is anticipated to influence the management of the region and strengthen the potential for balancing economic activity and maintenance of biological diversity.