Similar to 角川日本地名大辞典

United States Board on Geographic Names

Gazetteer

United Nations Conference on the Standardization of Geographical Names

Place names considered unusual

Advisory Committee on Antarctic Names

Barr (placename element)

Hiragana and katakana place names

Mar de Ajó

List of online dictionaries

BabelNet

Free On-line Dictionary of Computing

Tatoeba

William Whitaker's Words