As far as I understand lighthouses, especially large ones, are located on coastlines, ships more often are in oceans but sometimes travel down large rivers, then the codename for the map was zombie_coast so it sounds like ocean all the way. But then the wiki page says it takes place on the Tunguska river where the real Tunguska even took place (which it's own wiki page says it happened in the middle of Russia not even close to the ocean) and the timeline refers to it as just "Siberia, near the Tunguska River", and if I understand right the Tunguska river doesn't directly touch any ocean at all. Any ideas?