The Ryukyuan languages (琉球語派 Ryūkyū-goha, also 琉球諸語 Ryūkyū-shogo or しまくとぅば Shima kutuba "Island Languages") are the indigenous languages of the Ryukyu Islands, the southernmost part of the Japanese archipelago. Along with the Japanese language, they make up the Japonic language family. Although the Ryukyuan languages have sometimes been considered to be dialects of Japanese, they are not mutually intelligible with Japanese or even with each other. It is not known how many speakers of these languages remain, but language shift towards the use of Standard Japanese and dialects like Okinawan Japanese has resulted in these languages becoming endangered; UNESCO labels four of the languages "definitely endangered", and two others "critically endangered".