The Caspian Hyrcanian mixed forests ecoregion, in the world's temperate broadleaf and mixed forests biome, are a zone of lush lowland and montane forests covering about 55,000 square kilometres (21,000 sq mi) adjoining the shores of the Caspian Sea of Iran and part of that of Azerbaijan. The forest is named after the ancient region of Hyrcania. Since 5 July 2019, the Hyrcanian Forests have been a UNESCO World Heritage Site. Concentrated in Iran, this ecoregion comprises a long strip. This is the coast along the Caspian Sea and the northern slopes of the Alborz Mountains. It covers parts of five provinces, from east to west.