The Prizren–Timok dialect (Serbo-Croatian: Призренско–тимочки дијалекат / Prizrensko–timočki dijalekat) is the name given by Serbian linguists to classify transitional Torlakian dialects spoken in Eastern and South Serbia and Kosovo — an area spanning from Prizren in the south to the Timok River in the north — as sub-dialects of Old-Shtokavian. Its eastern border, starting from Zaječar, roughly forms the border with Bulgaria.
^Ethnologia Balkanica. Vol. 12. Lit Verlag. 2008. p. 157. The Vranje speech belongs to the Prizren-South Morava type in the Prizren-Timok dialect zone (Ivic 1985: 115-118)
Further reading
Динић, Јакша. Тимочки дијалекатски речник. Vol. 4. Ин-т за српски језик САНУ, 2008.