Keshi Fortress, located within the historical city of Merv in Turkmenistan, is an impressive archaeological site that testifies to the area's rich history. Merv, once a major oasis-city on the Silk Road, was a significant cultural and economic hub with a history that spans several millennia. The Keshi Fortress, specifically, was part of the larger site known as the Erk Kala which dates back to the 7th century BC. It is the oldest part of the city of Merv and has a unique round shape that is quite distinctive even among the other ruins found in the region. The fortress walls are still visible and showcase the formidable defensive strategies of ancient times. The materials used in construction mainly included mud bricks that have withstood the test of time. Limited archaeological excavations have provided insights into the fortress's layout, suggesting a central role in the city's defences. The ruins of Keshi Fortress today are part of the larger Historical and Cultural Park of Ancient Merv, which is a UNESCO World Heritage site.