Jánský vrch is a small but botanically remarkable nature reserve on the southern and western slopes of a hill northeast of the village of Korozluky, in the Most district. It protects rare, heat-loving and drought-tolerant steppe grasslands growing on warm basaltic bedrock - a true rarity within the České Středohoří landscape.

The protected meadow covers just 9.4 hectares, yet it marks the westernmost known point in the world where desert oat-grass (Helictotrichon desertorum) grows naturally. The terrain consists of open, sun-baked slopes offering views over the volcanic hills of the surrounding region. In late spring and early summer the grassland bursts into color with pasque flowers, pheasant's eye and other steppe wildflowers, making it a rewarding time to visit for nature lovers and photographers alike.

• Korozluky (bus stop Korozluky, obecní úřad) - no marked trail, reach the site directly across the fields, easy to moderate terrain
• Alternatively take a local bus from Most to Korozluky and continue on foot toward the hill northeast of the village

• No marked tourist trail leads to or near the reserve
• The site lies within Zone I protection of the České Středohoří Protected Landscape Area - picking plants and leaving designated paths is prohibited
• Protected species include feather grass (Stipa pennata), St Bernard's lily and pheasant's eye

Interestingly, the grassland was historically maintained by grazing livestock, and the absence of this practice today is one of the main threats to these unique steppe communities, now actively managed by the České Středohoří Protected Landscape Area authority.