There are many obscure place names and interesting place names in Japan. This app, "Dictionary of Obfuscated and Interesting Place Names", contains approximately 4,000 obfuscated place names and approximately 1,000 interesting (rare) place names scattered throughout Japan, by prefecture and municipality.
Obfuscated place names and interesting place names often have historical, topographical, and cultural meanings behind them. By knowing how to read them and comparing them with their locations on the map, you can appreciate the meaning and depth of the place names. I can. Using this app to learn how to read obscure place names and interesting place names correctly while having fun will also help you learn about the origins of Japan's geography and local culture.
Other appendices include "obfuscated station names", "how to read Chinese place names", "overseas place names in kanji", and "Ainu place names".