Japan Geography Master（日本地理マスター） is an educational app for elementary school students in Japan. Its main feature is a set of tappable interactive maps built with GeoJSON, helping children connect place names with real locations and geographic features. It also includes over 1,500 flashcards and 1,800 quizzes covering prefectures, mountains, rivers, plains, climate, agriculture, fisheries, and more. It supports school learning and junior high school entrance exam preparation. Japanese only.