Mount Diwata, also locally unofficially nicknamed Diwalwal, is a remote high range of volcanic mountain and biodiversity area in Davao Region on eastern part of Mindanao island of Philippines. Rich in gold and copper ores and mines, it is spread across the 3 municipalities: (a) Monkayo in the province of Compostela Valley; as well as (b) Cateel and (c) Boston in the province of Davao Oriental. Laguna Copperplate Inscription, the oldest written document in Philippines dated to 900 CE, refers to Mount Diwata.