Eastern Mansi
[aka Eastern Vogul, восточно-мансийский язык, кондинский-мансийский язык]Classification: Uralic
·severely endangered
The Wikipedia page for the Mansi language of Russia, which has four dialect: Northern, Southern, Eastern and Western. Very well detailed, with information on grammar, phonetics and a comparison with Hungarian, as well as various further readings (in various languages).