This basic vocabulary data set was collated using the 100-item Swadesh List (Swadesh, 1971) as its basis, and draws from the Dictionary of Contemporary Japanese Dialects (Hirayama, 1992) and The Complete Works of Tōsō Miyara (Miyara, 1980). The data set includes 58 Japanese and 32 Ryukyuan language varieties, for which geospatial data is also provided.