Located within the Northern Sierra Madre Natural Park, the Divilacan watershed in the forest-rich province of Isabela is one of the 29 priority sites in the national government’s Sustainable Integrated Area Development (SIAD) program. Implemented by the Department of Environment and Natural Resources (DENR), SIAD is a strategy that aims to rehabilitate through enrichment planting and reforestation idle and open areas, and safeguard and preserve the natural tropical forests of the watershed. It also aims to improve the quality of life of people in the areas covered. According to the DENR, the Divilacan watershed where the Dumagats or Agtas dwell consists of several sub-watersheds located at the middle section and upper portion of Divilacan town in Isabela province.d.

Domingo, L. C. (2018, February 1). Rehab set for watershed area in Isabela. Manila Times, p. B5.