Hyrcanian Forests

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Hyrcanian Forests: An Ancient Ecosystem of Biodiversity

The Hyrcanian Forests, a vast expanse of lush lowland and montane forests, cover approximately 55,000 square kilometers near the shores of the Caspian Sea in Iran and Azerbaijan. Named after the ancient region of Hyrcania, this unique forested massif has a rich history dating back 25 to 50 million years, making it one of the oldest forest systems in the Northern Temperate region. On July 5, 2019, the Hyrcanian Forests were officially recognized as a UNESCO World Heritage Site, further emphasizing their significance in global biodiversity.

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UNESCO Description of the World Heritage Site

The Hyrcanian Forests form a unique forested massif that stretches along the Caspian Sea in Azerbaijan and Iran. The history of these broad-leaved forests dates back 25 to 50 million years, when they covered most of this Northern Temperate region. Their floristic biodiversity is remarkable with over 3,200 vascular plant species documented. To date, 180 species of birds typical of broad-leaved temperate forests and 58 mammal species have been recorded. Elements of the property comprise full ecosystems including top predators such as leopard, wolf and brown bear, and the forest has a high degree of rare and endemic tree species. The oldest trees seen here are 300-400 years old, with some possibly up to 500 years old.

UNESCO Justification of the World Heritage Site

Criterion (ix): The property represents a remarkable series of sites conserving the natural forest ecosystems of the Hyrcanian region. Its component parts contain exceptional broad-leaved forests with a history dating back 25 - 50 million years ago, when such forests covered most parts of the Northern Temperate region. These huge ancient forest areas retreated during Quaternary glaciations and later, during milder climate periods, expanded again from these refugia. The property covers most environmental features and ecological values of the Hyrcanian region and represents the most important and key environmental processes illustrating the genesis of those forests, including succession, evolution and speciation. The floristic biodiversity of the Hyrcanian region is remarkable at the global level with over 3,200 vascular plants documented. Due to its isolation, the property hosts many relict, endangered, and regionally and locally endemic plant species, contributing to the ecological significance of the property, and the Hyrcanian region in general. Approximately 280 taxa are endemic and sub-endemic for the Hyrcanian region and about 500 plant species are Iranian endemics. The ecosystems of the property support populations of many forest birds and mammals of the Hyrcanian region which are significant on national, regional and global scales. To date, 180 species of birds typical of broad-leaved temperate forests have been recorded in the Hyrcanian region including Steppe Eagle, European Turtle Dove, Eastern Imperial Eagle, European Roller, Semicollared Flycatcher and Caspian Tit. Some 58 mammal species have been recorded across the region, including the iconic Persian Leopard and the threatened Wild Goat.

Encyclopedia Record: Hyrcanian forests

The Hyrcanian forests are a zone of lush lowland and montane forests covering about 55,000 square kilometres (21,000 sq mi) near the shores of the Caspian Sea in Iran and Azerbaijan. The forest is named after the ancient region of Hyrcania. The World Wide Fund for Nature refers to the ecoregion as the Caspian Hyrcanian mixed forests. Since 5 July 2019, the Hyrcanian Forests have been designated a UNESCO World Heritage Site. In September 2023, the heritage site expanded to incorporate portions of the forest located in Azerbaijan.

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IUCN World Heritage Outlook

The 2025 Conservation Outlook on Hyrcanian Forests reports the following assessment:

Source: International Union for Conservation of Nature (IUCN) · View assessment