Tandubas is a coastal municipality in the island province of Tawi-Tawi.

The municipality has a land area of 552.05 square kilometers or 213.15 square miles which constitutes 15.22% of Tawi-Tawi’s total area. Its population as determined by the 2020 Census was 34,316. This represented 7.79% of the total population of Tawi-Tawi province, or 0.78% of the overall population of the Bangsamoro Autonomous Region in Muslim Mindanao. Based on these figures, the population density is computed at 62 inhabitants per square kilometer or 161 inhabitants per square mile.