452 



ADAMS AND PRATT. 



Viads bowlaud from the name of its principal river, 

 graphic divisions are shown in text figure 2. 



These physio- 



LEGEND 



1 VIN AS LOWLAND 



2 GATBO UPLAND. 



2 SORSOGON LOWLAND 

 A BULAN PLAIN 



'■^.r.\: 



Fig. 2. — Physiographic divisions of southeastern Luzon. 



Southeastern Cordillera. — This mountain range is broken into three 

 parts by San ^lig-uel and Sorsogon Bay?. Tlie northern portion is broad 

 and, in addition to many features of moderate relief, contains three con- 

 spicuous mountainous areas. In tlie Cadig Mountains at the north 

 there is a peak which, according to the Coast and Geodetic Survey charts, 

 is 702 meters in height. As seen from a distance this gi'oup presents no 

 salient features. To the south of it, and separated by a long gap, is the 

 Labo group of peaks which is dominated by Mount Labo, having the ap- 

 pearance of a volcanic cone and rising to an elevation of 943 meters; 

 Mount Bayabas, just to the northeast, has an elevation of 433 meters. 

 There are two conspicuous spurs in this group, one extending to the west 

 and the other to the south. The Colasi group is separated from the Labo 

 Mountains by a gap. A number of its highest peaks stand near the shore 

 of San Miguel Bay. Some of the peaks may be of volcanic origin, bxit 

 there is no dominant volcanic cone. The highest determined elevation 

 reaches ?50 meters. Colasi Peak, which rises from the shore, has an eleva- 

 tion of 389 meters. This mountain is a noted landmark. Jagor has 

 ' jiublished a profile of it as seen from Lalanigan, a barrio to the southeast, 

 and this shows it with a subcouical form. A more interesting view is 

 obtained when passing the mountain on a steamship. 



