Sudovian language
(重定向自Jatvingian)

Sudovian (also known as Jatvingian, Yatvingian, or Yotvingian) is an extinct western Baltic language of Northeastern Europe. Closely related to the Old Prussian language, it was formerly spoken southwest of the Nemunas river in what is now Lithuania, east of Galindia and north of Yotvingia, and by exiles in East Prussia.