Okinawan language
The Okinawan language is only 71% lexically similar to, or cognate with, standard Japanese. Even the southernmost Japanese dialect (Kagoshima dialect) is only 72% cognate with the northernmost Ryukyuan language (Amami). The Kagoshima dialect of Japanese, however, is 80% lexically similar to Standard Japanese. There is general agreement among linguistics experts that Ryukyuan varieties can be divided into six languages, conservatively, with dialects unique to islands within each group also sometimes considered languages.