Alxa League
There are some varieties that are difficult to classify. The Alasha dialect in Alxa League in Inner Mongolia originally belonged to Oirat and has been classified as such by some because of its phonology. But it has been classified by others as Mongolian proper because of its morphology. The Darkhad dialect in Mongolia's Khövsgöl Province has variously been classified as Oirat, Mongolian proper, or (less often) Buryat.