Bengkalis Regency is a regency of Indonesia in the Riau province. The regency, which includes the whole of Bengkalis and Rupat Islands in the Strait of Malacca, has been established since 1956. The regency was formerly divided into 13 districts (or kecamatan); however five of these districts were removed to create the new Meranti Islands Regency, leaving eight districts in the Bengkalis Regency, which number has increased since 2010 to eleven by splitting of existing districts on the Sumatran mainland. Bengkalis Regency produces natural resources, particularly petroleum, rubber, and coconut. The regency is home to the Bukit Batu Biosphere Reserve.