Písečný přesyp u Vlkova, Nature reserve near Vlkov, Czech Republic.

Písečný přesyp u Vlkova is a protected nature reserve featuring an active sand dune landscape that stands out from the surrounding vegetation. The site displays characteristic sandy hills with pine trees scattered across them, creating a distinct dry environment.

Písečný přesyp u Vlkova was declared a nature reserve on 21 May 1954, covering 0.8 hectares. The dunes themselves formed at the end of the Pleistocene, when wind piled up sand from older Pleistocene river sands and gravels. The reserve is managed by the AOPK ČR, South Bohemia regional office, through the Třeboňsko Protected Landscape Area administration.

The reserve lies by the yellow hiking trail that runs along its edge, near the south bank of the Vlkovská pískovna sand pit and the railway line from Veselí nad Lužnicí to Třeboň. Entry into the protected area itself is prohibited, so the dunes are viewed from the marked path outside.

Entry into the reserve itself is prohibited to protect the dunes; a yellow-marked hiking trail runs along its edge, about 4 km south-southeast of Veselí nad Lužnicí near railway line 226 and the south bank of the Vlkovská pískovna sand pit. The dunes, 4 to 6 m high, are visible from a distance along this path.

Two species were first described scientifically from this dune: the springtail Dinocarsis hoffleri and the aphid Aphis succisae. The reserve covers only 0.8 ha, and entry into the protected area is prohibited; the yellow hiking trail passes along its edge.