Constitution: "The territory shall be divided into regions (oblasts), districts, cities and other administrative and territorial units. The administrative and territorial division of the State shall be determined by the legislation." from CONSTITUTION OF THE REPUBLIC OF BELARUS OF 1994 (with changes and additions adopted at the republican referenda of November 24, 1996* and of October 17, 2004) http://law.by/main.aspx?guid=3871&p0=V19402875e
Website of president: "There are six administrative regions (oblasts) in Belarus – Brest Oblast, Vitebsk Oblast, Gomel Oblast, Grodno Oblast, Mogilev Oblast, and Minsk Oblast. They are further divided into 118 districts." http://president.gov.by/en/facts-en/