捷詹是土库曼斯坦斯坦的城市，由阿哈尔州负责管辖，位于该国东南部卡拉库姆沙漠的哈里河左岸，距离首都阿什哈巴德195公里，海拔高度161米，2009年人口77,024。

Tejen (or Tedzhen) is an oasis city in the Karakum Desert, in Ahal Province of Turkmenistan. It is located at latitude 37.3786 North; longitude 60.4961 East at an altitude of 161 meters. It has a population of approximately 52,000.

The Hari River passes near Tejen, and is therefore known in Turkmenistan as the Tejen River.