ref: bbf2f51a02b2544f1bef32a5868503b474ae2fef dir: /data/maps/headers/Route20.asm/
map_header Route20, ROUTE_20, OVERWORLD, WEST | EAST connection west, CinnabarIsland, CINNABAR_ISLAND, 0 connection east, Route19, ROUTE_19, -18 end_map_header