Carpathian Ruthenia is a small region in Central Europe, now mostly in western Ukraine, easternmost Slovakia, Poland and a few villages in Romania and Hungary.
Historically, this specific geographic area with defined ethno-linguistic boundaries in the northeast region of Austria-Hungary, encompassed part of Galicia and the old Hungarian counties of Saros, Zemplen, Szepes, Abauj, Ung, Ugocsa, Bereg and Maramaros. People from this Carpathian Mountains region were members of the Greek (Byzantine) Catholic Church (also called Uniate) and the Orthodox Church.
In ethnic diversity, it is inhabited by Ukrainian, Rusyn, Lemko, Hungarian, Slovak, Romanian, Bulgarian and Russian populations.
To read more about the Carpathian Ruthenia region see Wikipedia.
Lemkos are one of the ethnic groups inhabiting the Carpathian Mountains in what is now Southeastern Poland, formerly in the province of Galicia. Their language has been variously described as a Lemko language, a dialect of the Ukrainian language, a dialect of the Rusyn language and more recently sometimes described as a distinct dialect of the Slovak. In any case, the Lemko tongue and the Ukrainian language are akin but not always mutually intelligible. Rusyn (also referred to as the Ruthenian language) is similar to the Slovak language and Ukrainian language; Ukrainian scholars consider Rusyn a dialect of Ukrainian.