Cagar Biosfer Giam Siak Kecil Bukit Batu (CB-GSK-BB) is one of seven Biosphere Reserves in Indonesia. They are located in two areas of Riau Province, Bengkalis and Siak. CB-GSK-BB is a trial presented by Riau at the 21st Session of the International Coordinating Council of Man and the Biosphere (UNESCO) in Jeju, South Korea, on 26 May 2009. CB-GSK-BB is one of 22 proposed locations in 17 countries accepted as reserves for the year. A Biosphere Reserve is the only internationally recognised concept of environmental conservation and cultivation. Thus the supervision and development of CB-GSK-BB is a worldwide concern at a regional level.