Sumisip

', officially the ' (Yakan: "Bulak "; Chavacano: "Municipalidad de "; ), is a in the province of , . According to the , it has a population of people.
12 barangays that were not on Basilan Island seceded to form the municipality of Tabuan-Lasa through "Muslim Mindanao Autonomy Act No. 187", which was subsequently ratified in a plebiscite held on March 29, 2008.
Barangays.
Sumisip is politically subdivided into 29 barangays.
Demographics.
In the , Sumisip had a population of .