Hi. I have asked long ago about this particular problem i have and it was long time ago i last tried, but now i did again. It relates to splitter and usage of --polygon-desc-file= This is how i have tried: 1. Download data for Estonia and Latvia. https://download.geofabrik.de/europe/estonia-latest.osm.pbf https://download.geofabrik.de/europe/latvia-latest.osm.pbf 2. convert to o5m and combine osmconvert estonia-latest.osm.pbf -o=estonia-latest.osm.o5m; osmconvert latvia-latest.osm.pbf -o=latvia-latest.osm.o5m; osmconvert estonia-latest.osm.o5m latvia-latest.osm.o5m -o=ee_lv.o5m; 3. Prepare an osm-polygon file with one area for Estonia and one for Latvia. (file attached) 4. Run splitter: java -Xmx2000m -jar ${SPLITTER} \ --polygon-desc-file=./polygon_ee_lv.osm \ --output-dir=ee_lv/splitted/ \ --max-nodes=750000 \ --no-trim \ ee_lv.o5m While running this is seems like the Latvia part is fine, but the Estonia crashes. The error message doesn't say much (that i understand). But maybe it makes some sense to you? I imagine something is wrong with the polygon file, but i dont know what. The polygon files is partially made in JOSM and partially manaully to re-use the same segments/edges which belong to both countries. (I could see that Gerd was using this concept in some example file for Germany and the alps, but i could not add two ways over one edge in JOSM, so i made manual chanegs in the file). I tried also making two separate boxes, one for each country, but that was just as bad (not reusing edges). Anything that could be suggested that i change or try? PS. i am trying this on small scale for two smaller countries, later i will apply it because i need to split europe in parts of max 4GB. Regards Karl