Dumingag is a 2nd class municipality in the eastern part of the province of Zamboanga del Sur. It is composed of 44 barangays, with a total land area of 618.50 square kilometers and a population of 46,039 per census in August, 2007.
Situated in the heartland of the Zamboanga peninsula and on the northwest portion of the fertile Salug Valley, Dumingag is bounded on the North by the municipality of Sergio Omeña, Sr.; on the East by the municipality of Mahayag; on the South by the municipalites of Sominot and Midsalip; and on the West by the municipality of Siayan.
Dumingag was part of the municipality of Molave when it was created into a barrio in 1950, and Jose Montuerto served as the