Vorontsovo Caves, Khosta Yew-Boxwood Grove and 33 Waterfalls

Beyond the coastal promenades, almost the entire forested hinterland of Greater Sochi belongs to Sochi National Park (Russia's oldest national park, founded on 5 May 1983 across 1,937 square kilometres) and the adjoining Caucasus State Nature Biosphere Reserve (created in 1924 and inscribed on the UNESCO World Heritage List in 1999). Sheltered from Pleistocene glaciation by the Main Caucasian Range, these humid valleys preserved pre-Ice Age Tertiary flora alongside some of the longest karst cave systems in the Western Caucasus.

The Vorontsovo Cave System (Vorontsovskaya Peshchera)

Located on the Vorontsovo Ridge in the upper reaches of the Kudepsta River in Khostinsky District near the village of Vorontsovka, the Vorontsovo Cave system is carved into Upper Cretaceous stratified limestone and comprises connected caverns including Vorontsovskaya, Labirintovaya, and Dolgaya with a total surveyed length of nearly 11.7 kilometres. More than ten natural entrances open into the slopes of the Kudepsta Valley at elevations between 419 and 720 metres above sea level.

Opened as an equipped show cave in the late 1990s, the circular tourist route winds through dramatic collapse chambers, including the Hall of Silence (Zal Tishiny), Bear Hall (Medvezhy), and Oval Hall, as well as dripstone galleries draped with multi-metre stalactites, stalagmites, and columns. Highlights along the lit pathway include the 20-metre-long Chandelier or Concert Hall (Estradny / Lyustrovy Zal) and the Prometheus Grotto, a highlight of the lit route. Archaeologists have excavated Late Paleolithic, Neolithic, and Chalcolithic hearths along with cave bear skeletons near the entrances.

The Khosta Yew-Boxwood Grove (Tiso-Samshitovaya Roshcha)

Just 2.5 kilometres inland from the Black Sea coast in the Khosta microdistrict on the eastern slope of Mount Akhun, the 302-hectare Khosta Yew-Boxwood Grove was declared a strict nature reserve in 1931 and forms an accessible coastal enclave of the Caucasus Biosphere Reserve. Acting as a living museum of Tertiary Period flora dating back 18 to 20 million years, the grove protects more than 500 plant species across 60 families, headed by ancient berry yews (Taxus baccata, called "mahogany" for their reddish heartwood, reaching heights of 30 metres and ages of over a thousand years) and iron-hard Colchic boxwood (whose wood is dense enough to sink in water; restoration plantings have been underway since an invasive box tree moth outbreak between 2012 and 2016).

Three marked trails traverse the reserve above the turquoise canyon of the Khosta River:

• Into the Depths of Centuries Trail (800 metres): A flat paved path suitable for all visitors.
• The Small Ring (1.6 kilometres): Passes giant millennial yews and the dramatic Stone Labyrinth (Kamenny Labirint), a tectonic limestone fault cleft formed 20 million years ago during the uplift of the Akhun massif.
• The Large Ring (5 kilometres): Follows the cliff edge above the Khosta River to the ruins of the medieval Khosta Fortress and canyon springs.

The 33 Waterfalls in the Shakhe Valley

In the northern Lazarevsky District near the Adyghe-Shapsug village of Bolshoy Kichmai in the Shakhe River valley, the mountain stream Dzhegosh tumbles down a mossy gorge through a sequence of 33 waterfalls, seven rapids, and 13 natural stone plunge bowls. Wooden boardwalk steps climb alongside the lower 17 cascades, beginning with a 10.5-metre lower fall. Pair these nature reserves with Akhshtyr Gorge and Psakho Canyon.