Columbia Games, one of the two publishers of Hârn materials, has uploaded a clickable, Google Maps-style map of the island of Hârn. It includes a huge amount of information as pop-ups on the map.
I once got to see one of the amazing multi-layered PDFs of the island that they sell, with layers for languages, wind currents, historical borders, etc. This is not that. But that PDF was a thing they sold, and this link contains a really remarkable amount of information — nearly everything that’s in the original gazetteer, I think. Very worth checking out.