The tunnel was originally cut by hand to power a local mill, avoiding the need for an expensive weir system.
The name 'Průrva' translates to 'the breach' or 'cleft' in English.
The water depth within the tunnel varies significantly depending on rainfall and seasonal runoff.
The tunnel is carved directly through a sandstone rock promontory.
In 1997, the site was officially declared a protected technical monument of the Czech Republic.
The Ploučnice Gorge, known locally as Průrva Ploučnice, is a man-made water tunnel carved into sandstone rock near Noviny pod Ralskem. Originally constructed in the 16th century, the tunnel served as a mill race to divert the Ploučnice River. The structure consists of two tunnel sections spanning a total length of approximately 150 meters. The rock passage is narrow and features high, sheer walls that create a distinct microclimate. It is a technical monument representing historical water management practices in the Liberec region. The area remains a popular spot for recreational kayaking and canoeing during periods of sufficient water levels.
From the water level looking directly into the mouth of the tunnel entrance.
Bring a waterproof flashlight if you intend to walk along the upper rim or explore the entry points.
Water levels can be shallow in mid-summer, making paddling difficult; check recent rainfall reports.
Wear footwear with strong grip as the surrounding rock paths are frequently damp and slippery.
Do not attempt to paddle through the tunnel if water levels are excessively high or if there are fallen branches blocking the narrow entrance.
Avoid excessive noise to preserve the quiet nature of the ravine; remove all litter.
