Ket, or more precisely Yeniseian as a whole, has been linked in a proposal to the Na-Dené languages of North America.
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It is known to be the last remnant of a small language subfamily, the Yeniseian languages, formerly spoken on the middle Yenisei and its tributaries.
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Attempts have been made to relate it to many other language families, including Altaic, Austroasiatic, Austronesian, Nihali, and the putative Indo-Pacific stock.
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#Mongolic, Tungus-Manchu and Paleosiberian languages (Монгольские, тунгусо-маньчжурские и палеоазиатские языки)