Vlašimská Blanice, Natural river monument in Tábor District, Czech Republic.

The Vlasimska Blanice is a river running through South Bohemian and Central Bohemian regions with natural banks lined by riparian woodlands and moist meadows throughout its course. The waterway meanders through relatively flat terrain surrounded by dense vegetation that supports a variety of plant and animal life.

The site was declared a natural monument by the South Bohemian Regional Authority, effective 2 January 2014. It partly overlaps the Vlašimská Blanice Site of Community Importance, designated in 2005, which covers 402.6 hectares and reaches as far as Vlašim in Central Bohemia. Until the early 21st century the floodplain meadows were mown or grazed, and fields and pastures still surround the river.

The name Blanice is related to the Czech word for meadow, and the valley floor is still farmed: the surrounding land holds mown and unmown meadows, pastures and fields. The river itself is unregulated here, forming meanders with gravel bars and undercut banks, lined by a continuous belt of alders and willows.

The protected strip follows the Blanice for about nine kilometres between the northern edge of Mladá Vožice and Skrýšov, in the cadastral areas of Běleč u Mladé Vožice, Mladá Vožice and Šebířov. The river is unregulated here, with meanders, gravel bars and undercut banks, so follow the mown meadow paths rather than the water's edge. The valley lies at 396–434 m and the stream is fed by the Slupský, Bzovský, Bělečský and Noskovský brooks.

The thick-shelled river mussel was found in the muddy deposits below Skrýšov in numbers of dozens, alongside the swan mussel and, in counts an order higher, the painter's mussel. The river mussel is one of the four species the monument was declared to protect in 2014.