Iranian Turkmen are a branch of Turkmen people living mainly in northern and northeastern regions of Iran. Their region is called Turkmen Sahra and includes stantial parts of Golestan.

Iranian Turkmens have long time represented a group of semi-nomadic tribes who retained a more traditional way. In Iran lived next Turkmen tribes — Yomut, Goklen, Īgdīr, Saryk, Salar and Teke.

Nearly two million Turkmen can be found living along the northern edges of Iran, just south of the Turkmenistan border. For centuries the Turkmen lived as nomadic herdsmen. In more recent years, however, many have changed to a “semi-nomadic lifestyle,” living in permanent homes as well as in tents. Today most of them are farmers and cattle breeders. Turkmen still live in extended families where various generations can be found under the same roof, especially in rural areas. Many tribal customs still survive among modern Turkmen. Unique to Turkmen culture is kalim, which is a groom’s “dowry” that can be quite expensive and often results in the widely practiced tradition of bridal kidnapping.

Source: https://en.wikipedia.org/wiki/Iranian_Turkmen