Grey Ukraine (also: Grey Klyn - Siryi Klyn; Ukrainian: Сірий Клин, also: Сіра Україна - "Grey Ukraine"; Russian: Серый Клин) is an unofficial name for a region in Southern Siberia and Northern Kazakhstan, where mass settlement of Ukrainians took place from the middle of the 18th to the beginning of the 20th century. Around 1917–1920 there was a movement for Ukrainian autonomy in the region.