Tosk (definite Albanian form: toskërishtja) is the southern group of dialects of the Albanian language, spoken by the ethnographic group known as Tosks. The line of demarcation between Tosk and Gheg (the northern variety) is the Shkumbin River. Tosk is the basis of the standard Albanian language. Major Tosk-speaking groups include the Myzeqars of Myzeqe, Labs of Labëria, Chams of Çamëria, Arvanites of Greece and the Arbëreshë of Italy, as well as the original inhabitants of Mandritsa in Bulgaria. In North Macedonia, there were approximately 3000 speakers in the early 1980s.