Kamenný vrch

Kamenný vrch is a modest hill and nature reserve in the Frýdlant projection (Frýdlantský výběžek), right next to the village of Horní Řasnice in the northern part of the Liberec Region, on the edge of the Jizera Mountains. It combines two things that rarely appear on the same short walk: a small wooden lookout tower and a reserve famous for an unusually dense concentration of anthills.

An anthill reserve

Kamenný vrch is protected primarily because of its exceptionally large population of the red wood ant (Formica polyctena). More than 200 anthills have been recorded within the reserve — almost every other tree shelters a colony. Some of the mounds are numbered, allowing visitors to identify individual colonies and track how they change from one season to the next. Such a dense concentration of anthills in a relatively small area is unusual in the Czech Republic, and it is the main reason the hill was designated as a protected site.

Ants are far from the only residents, though. Entomological and zoological surveys have documented 93 species of spiders, 78 species of ground beetles, and 54 species of vertebrates within the reserve. This diversity makes the site, despite its small size, a valuable fragment of the local ecosystem and a point of reference for researchers studying invertebrates.

A lookout tower from 1928

A small wooden lookout tower stands on top of the hill — one of the more modest structures among the many lookout towers scattered across the Jizera Mountains region. It was designed by architect Čeněk Ruller and built in 1928 in the functionalist style. Standing only about 6 metres tall, it is among the shorter lookout towers in the area, functioning more as a landmark and a walking destination than as a platform for sweeping panoramic views from great height. After years of decline, the tower underwent reconstruction in 2011, once again making it possible to climb.

A nature trail with seven stops

An educational nature trail runs through the reserve, with seven stops marked by information panels describing the local flora and fauna, including features typical of the steppe-like habitats found on the hill. This is a common approach in Czech nature reserves, designed to let visitors explore independently without a guide — simply moving from one panel to the next reveals why this particular hill was singled out for protection.

A green-marked tourist trail leads to Kamenný vrch starting from the village of Horní Řasnice. The walk is short and requires no special level of fitness, which makes the site suitable both for families with children and for nature enthusiasts looking for a quiet, low-key destination for an afternoon outing.

Frequently asked questions

What is there to see at Kamenný vrch? Above all, a nature reserve with more than 200 anthills of the red wood ant, a wooden lookout tower from 1928, and an educational trail with seven stops.

How tall is the lookout tower? It stands about 6 metres tall and was designed by architect Čeněk Ruller in the functionalist style.

Is the trail suitable for families with children? Yes, the green-marked approach from Horní Řasnice is short, and the educational trail with information panels works well as an attraction for younger visitors.

Why is the area protected? Because of the exceptionally high density of red wood ant colonies, along with a rich population of spiders, ground beetles, and vertebrates.