The 難読面白地名辞典 (Difficult-to-read and Interesting Place Name Dictionary) is a free Android application developed by Mejiro Publications. This travel and navigation app aims to introduce users to the vast collection of challenging and amusing place names found throughout Japan. With approximately 4,000 difficult-to-read place names and 1,000 interesting (unusual) place names, the app provides a comprehensive database that is categorized by prefecture and municipality.

Many difficult-to-read and interesting place names in Japan have historical, geographical, and cultural significance. By learning their correct pronunciations and mapping their locations, users can delve into the meanings and depth of these place names. This app not only allows users to have fun while learning the correct pronunciations of challenging place names, but also provides insights into the geography and local culture of Japan.

In addition to the main content, the app also includes supplementary information such as "Difficult-to-read Train Station Names," "Pronunciations of Chinese Place Names," "Romanized Spellings of Foreign Place Names," and "Ainu Language Place Names."