Plizio Visual Lab
Slanské Mountains

Weather…
Water temperature…
The Slanské Mountains, located in eastern Slovakia, are a volcanic mountain range that separates the Košice Basin from the Eastern Slovak Lowland. The range's highest peak is Šimonka, reaching an elevation of 1092 meters and noted for its rugged volcanic terrain. Geologically, the region is internationally famous for the Dubník opal mines, which were once the world's primary source of precious opals, including the renowned 'Trojan Fire Opal' owned by Napoleon. The legacy of ancient volcanic activity is still evident in unique phenomena like the Herľany Geyser, one of the few cold-water geysers in Europe, situated on the western slopes. The landscape is characterized by extensive deciduous forests, deep valleys, and dramatic rock formations that provide nesting sites for rare birds of prey like the lesser spotted eagle. The Slanské Mountains offer a tranquil escape for hikers and nature enthusiasts, featuring a network of trails leading to both natural wonders and historical ruins like Slanec Castle.
- Location: Slovakia
- Top sights: Hradisko · Dubník · Náučný chodník Dubnické bane
- Nearby: Vranov nad Topľou (14 km)
Best time to visit & climate
The most pleasant time to visit is Jun–Aug.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | -5 | -3 | 2 | 8 | 14 | 17 | 19 | 19 | 14 | 8 | 3 | -3 |
| Rain mm | 40 | 39 | 40 | 47 | 87 | 93 | 103 | 72 | 63 | 59 | 45 | 42 |
📋 Practical info
Geography
Facts
- The highest peak, Šimonka, reaches 1092 meters above sea level.
- The Dubník opal mines are the oldest in the world.
- The range was formed by Neogene volcanic activity.
- The Herľany Geyser is a national natural monument at the mountain's edge.
- The Trojan Fire Opal, found here, is kept in the Vienna Museum.
- The mountains are a key habitat for the Eastern Imperial Eagle.
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
© OpenStreetMap contributors · OpenRouteService
Sights in the town Slanské Mountains (5)
Sights nearby
Frequently asked questions
Where are the Slanské Mountains located?
What valuable natural resource was found here?
What is the name of the highest peak?
Are there historical castles in the Slanské Mountains?
What is the flora of the mountain range known for?
Slanské Mountains: where is it located?
Slanské Mountains: what is there to see?
Slanské Mountains: when is the best time to visit?
Slanské Mountains: why is it worth visiting?


















