THE GEOLOGY OF LUZON, P.I. 43 
Bulacan Delta into Manila Bay. This river is not navigable to any 
great extent, but at Norzagaray the river has some falls where 
considerable power could be obtained. 
The Bued River —The next river in point of size is the Bued 
River, which, while much shorter than the Agno, flows in the same 
direction, and is only mentioned here, because of its connection 
with the famous Benguet Road. This river is probably responsible 
for more damage to the works of man than any other river in Luzon. 
During the summer of 1911, it was the scene of a very destructive 
flood, which was due to a cloudburst, near Baguio. Thirty-seven 
inches of rain fell in twenty-four hoursin Baguio. The larger part 
of this water flowed into the Bued River Canyon, and at the lower 
end, there occurred a great landslide which dammed the stream to a 
height of 60 feet. When this dam broke, a large portion of the 
lower end of the Benguet Road was washed out into the Pangasinan 
Plain. This road has suffered repeatedly from these floods. 
The Pasig River—rThe Pasig is a very short river, 15 miles, 
very deep and of moderate width, and is the outlet of Laguna de 
Bay. It is important mainly because of the great volume of 
commerce which travels along it, and for the fact that the capital of 
the Archipelago is situated at its mouth. This river is tidal in its 
lower section, about up to Fort McKinley. From here on to the 
lake, it is much narrower and quite shallow in places. The river 
has a very treacherous current. 
The Paracale River —The Paracale River is mentioned here not 
on account of its size, but because it is distinguished by two very 
important features. The most important is that it is probably the 
richest river of all, there having been discovered considerable 
stretches of rich gold placers along its course. From a physiographic 
point of view, it is interesting, because, in its lower portion, this river 
is a drowned river. It has long been known that the Camarines 
coast is subsiding. 
THE LAKES AND SWAMPS 
The true lakes in Luzon are first and foremost, Laguna de Bay; 
second, Taal Lake; third, Laguna de Canaren, Bato and Buhi, 
while the following, Paway, Cagayan, Pamplona, Mangabol, and 
Candaba are merely great swampy areas, whose size changes with 
the seasons. 
