Lianga, officially the Municipality of Lianga is a 4th class municipality in the province of Surigao del Sur. Lianga is one of the oldest towns of the province of Surigao del Sur by virtue of Executive Order No. 27 on October 17, 1919. The municipality of Lianga is centrally located in the province of Surigao del Sur. It is situated along the Lianga Bay facing the Pacific Ocean and cradled by its shorelines and the Diwata Mountains.