Lake Buluan, bottom right, is a lake located in the island of Mindanao, Philippines. It is sandwiched between the provinces of Maguindanao and Sultan Kudarat. With an estimated surface area of 61.34 square kilometers, it is the third largest lake in Mindanao. It has an average elevation of 4.5 meters.
The lake actually consists of the adjoining marshy basins of the Pulangi, Maanoy, Buluan, Alah rivers, which are all tributaries of the Mindanao River. The river and other smaller lakes in this marshy area are visible in the middle section of the image.
The Mindanao River, also known as the Rio Grande de Mindanao, is the second largest river system in the Philippines. It is also the largest river on the southern Philippine island of Mindanao, having a drainage area of 23,169 square kilometers and draining majority of the central and eastern portion of the island.
Flowing out of the mountains, it forms the center of a broad, fertile plain in the south-central portion of the island. Before its mouth in the Moro Gulf, it splits into two parallel sections, the Cotabato and Tamentaka, separated by a 180 m (600 ft) hill.
Upon opening the full version of this orthorectified image, the stratovolcano Mount Ragang, also called Mount Piapayungan and Blue Mountain by the local people, can be seen at the upper left. It is the seventh highest mountain in the Philippines, with an elevation of 2,815 metres (9,236 ft) and a base diameter of 32 km (20 mi).