I just found out through https://pota-map.info/ this one magic #POTA location here in town is not five "parks", but actually eight. Six long-range hiking trails, all starting at a point that's just within the confines of a National Park.
The POTA website not having a definitive, global database of park boundaries/trail courses can be a major source of frustration. There are multiple third-party mapping projects that each cover just one or maybe a couple of countries.