Sacabia River
If you go to the Hill Housing area and keep climbing the hills westward, this is what you see. You are much closer to Mount Pinatubo (not visible, off to left). To the right side you can see the Mactan Housing area, the furthest westward extent of Clark Air Base. Just a couple of hundred yards away is the Sacabia River (also known as Bambam Wash), which carried vast amounts of ash and pyroclastic flow from Mount Pinatubo.