Japan Information Network's page for Gunma Prefecture contains links to all of the offical city homepages in English in Gunma. These cities are highlighted on this page's map of Gunma, so you can get an overview of where different places are. An inset map of Japan gives an idea of Gunma's location. The pull-down menu cross-references you to other prefectures in the Kanto Region.
http://www jinjapan org/region/pref/gunma html (added 2002-02-26)