 Of the four types of facilities of prisons in Russia, the corrective colony ( or "IK") is the most common, with 760 institutions in 2004 across the many administrative divisions of Russia.In 2012, the Russian Federal Penitentiary Service reported that 585,000 prisoners were serving sentences at penal colonies, more than the 260,000 prisoners held in detention centers.Corrective colony regimes are categorized as very strict/special, strict, general, and open.