Geography of the Philippines Bay. Laguna de Bay, east of Manila Bay, is the largest freshwater lake in the Philippines. Several rivers have been harnessed for hydroelectric power. To protect the country's biological resources, the government has taken a first step of preparing a Biodiversity Action Plan to address conservation of threatened species. The islands are volcanic in origin, being part of the Pacific Ring of Fire, and are mostly mountainous. The highest point in the country is the peak of Mount Apo in Mindanao, which is above sea level. The second highest point can be found on Luzon at Mount Pulag, a peak
Laguna Lakeshore Expressway Dike the expressway dike from causing larger-scale flooding on the eastern shore of the lake is the construction of a 20 Kilometer "Pacific spillway." This would take the form of either a tunnel or an open canal which would begin at the eastern shore of Laguna de Bay, cross the Sierra Mountains, and release water into the Pacific Ocean somewhere along the shore of Infanta. In an August 23 interview with GMA News TV's News to Go, Laguna Lake Development Authority General Manager Nereus Acosta said that the government would be pursuing this project in place of the 1970s Parañaque spillway