The dialect is named after Slavic toponyms for the cities of Thessaloniki (Solun), Edessa (Voden) and Kilkis (Kukush), or after the river Vardar.
In terms of Macedonian dialectology, the dialect is classified as a member of the south-eastern subgroup of the Eastern and Southern group of Macedonian dialects,[5] spoken in an area that also covers Veria, Giannitsa,[6] and the towns of Dojran and Gevgelija in the Republic of North Macedonia.
The dialect is best preserved in the villages of Sochos (Сухо, Suho), Osa (Висока, Visoka), Nikopoli (Зарово, Zarovo), Xylopoli (Негован, Negovan), Levchohori (Клепе, Klepe), Klisali (Клисали, Klisali) and Assiros (Гвоздово, Gvozdovo).
One of the first researchers of the Slavic dialects in this part of Macedonia, Slovenian linguist Vatroslav Oblak described the historical development of the Bulgarian phonology and morphology, based mainly on the dialect of Suho and the adjoining area.
He noted that the villages Suho, Zarovo and Visoka formed a center of nasalization.