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. Oasis in the Libyan part of the Sahara In geography, an oasis is an isolated area of vegetation in a desert, typically surrounding a spring or similar water source. ... For the desert in Kazakhstan, see Aral Karakum. ... Ahal is one of the Welayatlar of Turkmenistan. ...

The Hari Rud passes near Tejen, and is therefore known in Turkmenistan as the Tejen River. The Hari Rud is a river flowing from the mountains of central Afghanistan to Turkmenistan, where it disappears in the Kara-Kum desert. ...