When the Ice Ages scraped Europe’s forests away, one green ribbon survived: the woods pinned between the Caspian Sea and the mountains behind it. The Hyrcanian Forests are tens of millions of years old as an ecosystem — relics of the broadleaf cover that once wrapped the temperate world — and since 2019 they are World Heritage, extended in 2023 across the Iranian–Azerbaijani border.
The property runs in a long arc along the Caspian’s southern and southwestern shores: humid mountain forest fed by the sea’s moisture, dense with species that vanished from Europe long ago. Our route pairs one anchor in each country — Azerbaijan’s Hirkan National Park and Iran’s Golestan, the oldest national park in the country — as two doors into the same relict wood.
A forest older than the ice
The Hyrcanian belt is what botanists call a refugium: mountains and sea conspired to keep the climate mild while glaciations simplified the rest of the continent’s flora. The result is a living archive — ironwood, Persian silk tree, chestnut-leaved oak, Caucasian zelkova — lineages whose European relatives exist only as fossils. Autumn turns the ironwood forests into colour fields; spring drips, literally, since these are among the wettest woods of western Asia. Walking them feels less like visiting a forest than visiting the forest, the one the others descended from.
Hirkan: the Azerbaijani door
Hirkan National Park, in the Talysh mountains near Lankaran, protects the northern end of the arc — the humid slopes where Azerbaijan’s share of the 2023 extension lies. Trails from the park entrances thread stands of ironwood and centuries-old oaks; the ironwood’s bark-shedding trunks and interlocking branches make winter walking as striking as summer’s green vault. Lankaran, with its tea plantations and Caspian beachfront, is the comfortable base.
Golestan: the Iranian benchmark
Across the border arc, Iran’s Golestan National Park is the country’s oldest and among its richest: a full cross-section from Caspian rainforest through juniper woodland to steppe in a single protected block, with leopard at the top of an intact food web. The Tehran–Mashhad road runs through it, which makes Golestan the rare strict reserve you can legitimately see from a bus window — though the forest only opens itself properly on the marked trails and with local guides.
One forest, two republics
Iran inscribed fifteen Hyrcanian components in 2019; the 2023 extension added Azerbaijan’s Hirkan clusters, making the forest a transboundary property and completing the arc on the map. The joint listing matters practically — the two countries now answer to one conservation standard for a single ecosystem — and symbolically: the forest predates both states by geological ages, and the inscription file is one of the few documents to say so out loud.
Planning the journey
These are two separate trips joined by an idea. Hirkan is straightforward: Lankaran is a few hours from Baku by road or rail, the park entrances minutes further, and spring or autumn are ideal. Golestan asks more logistics — access via Gorgan or the park-crossing highway, guides arranged locally, and attention to current travel advisories for the region. In both, the forest is the destination rather than any single sight: plan walking days, not checklists, and pack for humidity in any season. October, when the ironwoods turn, is the connoisseur’s month on either side of the border.
A bestiary in the understory
The forests’ fauna reads like the flora: survivors and specialists. The Persian leopard — the largest of the leopard subspecies — still hunts the Hyrcanian slopes, its stronghold populations shared between the two countries; brown bear, lynx, wild boar and red deer fill out a large-mammal community that vanished from most temperate forests of this latitude centuries ago. The Caspian tiger hunted here within living memory — the last confirmed records date to the twentieth century — and its absence is the cautionary tale the leopard programs are built to avoid repeating. Overhead, the forest belt funnels one of Eurasia’s great raptor migrations along the Caspian shore each autumn.
For the walker this translates into a specific etiquette: these are guided-trail forests not only for your orientation but because the wildlife is genuinely wild, and the local guides read tracks, scat and the sudden silence of jays far better than any app. Sightings of the big cats are vanishingly rare — treat the pugmark in the mud as the prize it is. What you will reliably see is the forest behaving like an ecosystem rather than a park: browsed saplings, turned stones, wild fruit stripped at bear height. In Europe that sight takes rewilding budgets; here it never left.