100 
HYDEOGEAPHIC REPORTS. 
low and thickly wooded, but passable on either hand ; the inner 
channel admitting vessels drawing seven feet, and the eastern 
one a draught of not less than twenty. At the upper end of this 
island, lying contiguous to each other on the left bank, are the 
ranchos of Angelillo, Longinos and La Monteria. Leaving 
these, the river bends sharply to the eastward, and subsequently 
to the south, until reaching the Chichi gapa, a distance of ten 
and three-quarter miles from the mouth of the river. Up to 
this point the least depth in channel is sixteen feet. This arroyo 
joining on the left is quite large, and is said to connect near its 
head-waters with the river Coachapa. In fact, all the immense 
tract of land lying opposite Mina-titlan, and bounded by the 
Coatzacoalcos and Uspanapa, as far up as the junction of these 
last-named tributaries, is known as the " Potrero de la Isla." 
The Chichigapa, although narrow and tortuous, is sufficiently 
deep to admit of schooners ascending it for some distance. Its 
chief characteristic now is the abundance and excellent quality 
of fish in its waters. Immediately opposite the entrance to this 
stream, and rising somewhat abruptly from the river margin, is 
the Cerro Dona Maria, a circular hill of considerable magnitude, 
densely studded with mahogany, guapaque, cedar, zapote, and 
macaya, all or either of which may be shipped from the spot, as 
the bank is sufficiently high, and the water deep enough to ad- 
mit of a vessel's loading there without difficulty. Above this, 
the river becomes exceedingly sinuous for a distance of five 
miles, with low banks, which are subject to overflow, and its 
least depth in channel is twelve feet, with a bottom alternating 
between blue clay and basaltic sand. This portion is termed 
the " Torno Ceiba," at the termination of which is the small 
Hemolino (or whirlpool) of Amate, and the beginning of a 
broad reach extending in a northeast direction for two miles. 
At its upper extremity on the right shore is an out-cropping 
of sandstone rock, the strike of which is E". 22° E., and the 
dip 20° 30' E. This is called by the Indians La Laja, and 
gives name to the bend. Within the distance of half a mile 
on the same margin is the Arroyo Mexcalapa, connecting 
with, and furnishing an outlet for, a lagoon of the same name, 
lying between the Tancochapa and San Antonio rivers, and 
