Mt. Ping-as is part of the Sierra Madre mountain range and situated in the municipality of Pakil. Residents of the municipality consider the mountain to be a blessing as it provides them water for irrigation and for their daily needs. Besides its importance to their daily lives, the mountain is also significant to their culture, as devotees hike up the mountain on the last Saturday of May every year to attend mass and witness the Santacruzan in a tradition they call “Ahunan sa Ping-as”. The same mountain is currently under threat due to a planned hydropower plant project proposed by Ahunan Power, Inc., a joint venture between Prime Metro Power Holdings Corp. and JBD Water Power Inc.