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Which rivers marked the territory where the Slavs lived before their expansion?

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Map of Europe showing the geographic distribution of Slavic languages, color-coded by language group: East Slavic (Russian, Ukrainian, Belarusian), West Slavic (Polish, Kashubian, Czech, Slovak, Sorbian), and South Slavic (Bosnian-Croatian-Montenegrin-Serbian, Slovene, Bulgarian, Macedonian). Striped areas indicate regions where bilingualism is common. — Slavic languages Distribution of the Slavic languages in Europe.

Until the middle of the 1st millennium CE, the Slavs were known to other peoples as the inhabitants of the vast territories situated between the Dnieper River and the Vistula River.1

While the exact geographic borders of their early habitat remain a subject of scholarly discussion, these two rivers are frequently cited as the primary markers of the region where the Slavic peoples resided before their significant westward, southward, and northward expansions in the 6th century CE.12