Same for me RR, I hadn't realized it was real place until I googled Iwaizumi Japan - and got a result, saw the reference to the caves and everything. So I just stole your thumbnail because I recognized the terrain from the Google Maps I've seen of the area and will use that for reference.
My plan is to focus more on the village and its immediate surroundings, then as Torstan suggested place an inset showing the wider region, including the mentioned mountain to the southwest and the caves to the north. That's my plan anyway.
Glad to see you starting early for a change! I'll get something posted today or tomorrow, once I finish the pain-in-the-ass day job that's so big its going into my evenings to finish and taking away good mapping time.