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
Tadlac Lake in 1999, which in turn led to the cessation of aquaculture activities on the lake. Prior to the introduction of aquaculture, Alligator Lake was considered as an oligotrophic lake, having low nutrient content and low algal production, resulting in very clear water with high drinking-water quality. Alligator Lake is located in Barangay Tadlac, in the hot springs resort town of Los Baños ('The Baths' in English) near the border with Calamba City in the province of Laguna. The lake is contained in a piece of land jutting out to the Laguna de Bay that was known as "Malilimbas Point", and