Silk Road oasis metropolis of successive adjacent walled cities.
Best-preserved sequence of layered planned oasis cities on the Central Asian Silk Road.
Merv is the best-preserved of the oasis cities of the Central Asian Silk Road, comprising a series of adjacent walled cities built across more than two millennia. The Achaemenid-era citadel of Erk Kala was followed by the Hellenistic foundation of Gyaur Kala, a roughly square walled city about two kilometres on a side containing a central mosque, a Buddhist stupa and monastery and other monuments. From the eleventh century the medieval city of Sultan Kala grew alongside as a Seljuk capital, dominated by the great brick mausoleum of Sultan Sanjar, until the oasis was devastated in the thirteenth century.
Merv documents, in a single oasis, the long evolution of planned urbanism along the Silk Road, from Hellenistic and Sasanian walled cities to a Seljuk imperial capital. Its surviving citadels, walls, mosque, mausoleum and water systems make it an exceptional record of layered city-building and cross-cultural exchange in Central Asia, recognised as a UNESCO World Heritage site.