XI, A, 5 Pratt: Philippine Lakes 231 



zon, similar in character to the lakes of the Central Plain, is 

 known as Lake Cagayan; it lies but little above sea level and 

 is said to cover an area of more than 100 square kilometers. 



Lake Paoay is situated in Ilocos Norte Province and is 

 separated from the sea by a low, narrow barrier of wind- 

 and water-borne sand. Its area, according to the Director of 

 the Coast and Geodetic Survey, is 4.06 square kilometers and 

 its maximum depth about 10 meters. No streams discharge into 

 it or flow from it, and its level must be very nearly that of the 

 adjacent sea. 



A number of small crater lakes in southwestern Luzon should 

 be mentioned to complete the list for this island. The volcanic 

 region in which these lakes are found is marked by numerous 

 cinder cones, and the lakes occupy the small craters around which 

 these cones were built up. Thirteen such crater lakes are shown 

 on Adams's reconnaissance map of southern Luzon, no one of 

 which is more than 1 kilometer in its greatest dimension. They 

 are most numerous immediately south of Laguna de Bay and 

 are found as far west as the town of Nasugbu. A crater lake 

 near the town of San Pablo has acquired a reputation locally 

 as a point of scenic interest. 



LAKES OP MINDANAO 



Next to Luzon, Mindanao is of most importance in a study of 

 Philippine lakes. Smith ^^ enumerated thirteen lakes in his 

 study of the physiography of Mindanao, and it appears that 

 his list was not complete. 



LAKE LANAO 



Lake Lanao, in the Lanao upland region of central western 

 Mindanao, is the second large lake in the Philippines and is the 

 only large body of water at any considerable elevation. Accord- 

 ing to the Director of the Coast and Geodetic Survey Lake 

 Lanao has an area of approximately 347 square kilometers and 

 its surface is 700.4 meters above sea level. Its outline is irreg- 

 ular, but is slightly elongated from northeast to southwest. 

 Soundings made in 1904 by engineers of the United States Army 

 in the southeastern portion of the lake revealed a depth ranging 

 from 78 to 112 meters; several harbors are utilized in the lake 

 shipping, and depths of 2.7 to 4.6 meters are recorded for the 

 water alongside. No soundings have been made in the center 

 of the lake. The lake is drained by a single stream, Agus 



"This Journal, Sec. A (1910), 5, 356. 



