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Yonkalla Indians. The southernmost Kalapooian tribe, formerly living on Elk and Calapooya Creeks, tributaries of Umpqua River, Oregon. According to Gatschet there were two bands, called Chayankeld and Tsantokau by the Lakmiut, but it seems likely that the former name (Tch’ Ayanke-‘ld) is merely the native tribal name. The tribe is probably extinct.