Davao del Sur ( Cebuano : Habagatang Dabaw ; Filipino : Katimugang Davao ), officially the Province of Davao del Sur , is a province in the Philippines located in the Davao Region in Mindanao . Its capital is Digos . Davao City is the largest city in terms of area and population within the province's jurisdiction, yet it is administratively independent from the province; as such, Davao City is only grouped for geographical and statistical purposes.