The corrdinates for the Kola Project boundary are used for the surface
maps, i.e. for Krige and Smoothing maps. It is a list with two list
elements x and y for the x- and y-coordinates.
References
C. Reimann, P. Filzmoser, R.G. Garrett, and R. Dutter: Statistical Data Analysis
Explained. Applied Environmental Statistics with R. John Wiley and Sons, Chichester, 2008.