Badab Soort Springs Badab Surt Sari is a unique travertine stepped spring in Iran and rare in the world, located in the village of Erest, Chahardangeh district, Sari county. This spring was registered by the Cultural Heritage Organization in 2008 as the second natural heritage of Iran in the list of national monuments after Mount Damavand in Amol. The world registration of this Badab was also as the second salt water spring in the world after Pamukkale in Türkiye.