Hi all, It looks like I managed a way to render those complex multipolygon administrative borders correctly now. In the relation style file, I changed administrative borders statements like this: # country borders (type=boundary | type=multipolygon) & boundary=administrative & admin_level=2 { apply { set boundary2=yes; set mkgmap:boundary2_name='$(mkgmap:boundary2_name)/${name}' | '${name}'; } } For my map of the Netherlands, I'm only interested in admin levels 2,4 and 8 (country/province/municipality) so I copied those lines for provinces (set boundary4=yes for the lines and boundary4_name for the names) and municipalities (set boundary8=yes and boundary8_name) too. I'm not sure if mkgmap: has any function, maybe without this it will function as well? In the line style file, I removed all the statements regarding to the admin. borders and replaced it with these lines: boundary2=yes { name '${mkgmap:boundary2_name}' } [0x1e resolution 16] boundary4=yes { name '${mkgmap:boundary4_name}' } [0x1d resolution 18] boundary8=yes { name '${mkgmap:boundary8_name}' } [0x1c resolution 20] I tested it with the complicated area, and it seems rendering fine now :-)