noun
linguistic geography; geolinguistics
Academic field studying the geographical distribution of languages and dialects. Often used in linguistics contexts.
See also: 言語地理
言語地理学は、方言の分布を地図上に示す研究分野です。
Linguistic geography is a field of study that maps the distribution of dialects.
言語地理 is a shorter form sometimes used in compounds or as an abbreviation, but 言語地理学 is the full academic term.
Compound of 言語 (language) + 地理 (geography) + 学 (study). A straightforward modern academic term.