Lávový proud u Meziny

Lávový proud u Meziny (the Lava Flow near Mezina) is a small but geologically remarkable nature monument sitting right next to the village of Mezina in the Bruntál district of the Moravian-Silesian Region. Covering just 1.22 hectares, the protected area punches well above its size, offering visitors a striking view of rock formations that resemble stone organ pipes, formed from lava that solidified nearly two million years ago.

Where does the name come from?

The reserve takes its name directly from its origin: it is a preserved fragment of an ancient lava flow that once poured out from the nearby Venušina sopka volcano, whose summit rises to 643 meters above sea level just southwest of the protected site. The area lies close to the northwestern shore of the Slezská Harta reservoir, making it an easy stop for anyone walking the trails around the lake.

What can you see in the former quarry?

The nature monument occupies the site of a disused quarry, where extraction work once exposed an extraordinary rock structure. The plagioclase basalt that makes up the lava flow cooled in a distinctive pattern, forming regular, polygonal columns through a process known as columnar jointing, along with patches of spheroidal jointing that give some blocks a rounded, layered appearance. The result is a landscape often compared to stone organs, with vertical basalt columns lined up side by side like the pipes of the instrument.

How old is the rock?

Radiometric dating has placed the age of the basalt at roughly 1.8 million years, corresponding to the early Pleistocene. That makes the Lávový proud u Meziny a direct record of the volcanic activity that shaped this part of Moravia long before humans settled the region. The site was granted formal protection in 1997 in recognition of its unique geological value.

Are there any protected plants here?

Beyond its geological importance, the site also holds some ecological value. Biting stonecrop (Sedum acre), a protected plant species, grows here, taking hold on the bare, soil-poor rock surfaces that would be inhospitable to most other vegetation. Its small yellow flowers add a touch of color to the otherwise stark, stony terrain of the former quarry.

Can you walk into the old quarry?

Visitors are free to explore the reserve, but caution is advised — rocks within the former quarry can be loose, and fragments of basalt occasionally break away and fall. Entry is at each visitor's own risk, so it is wise to keep a safe distance from steep rock faces and exercise common sense when viewing the columns up close.

How do you get to the lava flow?

A local educational trail called "Po vulkanitech" (Along the Volcanics) connects the summit of Venušina sopka with the village of Mezina and leads directly to the quarry. The route places the reserve in its broader geological context, tracing the volcanic history of the region. It makes for a rewarding, off-the-beaten-path destination for anyone interested in geology or looking for a less conventional stop near the Slezská Harta reservoir.

Frequently asked questions

Is this still an active quarry? No, extraction ended long ago, and the site is now protected as a nature monument.

Is there an entrance fee? The reserve is freely accessible and requires no ticket, though visiting is done at one's own risk due to unstable rock surfaces.

What else can you combine with a visit? A hike up Venušina sopka and a walk along the shore of the Slezská Harta reservoir, both located right next to the reserve.