NA VIGA TION. 59 



Cassilhas Point, being the eastern point of what 

 may be termed the port of Lisbon, and from 

 whence the wide expanse already alluded to 

 opens out ; here the river is a long mile wide, 

 but it narrows to about three-quarters of a mile 

 at Belem, when it becomes considerably wider, 



and at its entrance it is if miles across. 

 ***** 



" CACHOPO OR CACHOP SHOALS. Off both 

 points of the entrance to the Tagus there are 

 dangerous sandy shoals extending in a westerly 

 direction, and having between them a deep 

 channel, which is nowhere less between the 

 five fathom lines of soundings than nine-tenths 

 of a mile in breadth. The shoals are called 

 the North and South Cachopo. 



" From the depth of 4! fathoms, at the west 

 end of the North Cachopo, Fort San Julian bears 

 about E. by N.JN., distant about 3^ miles. 



" Thence the shoal, with from 2\ to I fathom 

 water on it, extends in the direction of the fort, 

 leaving at its east end a narrow passage into 

 the Tagus, called the North Channel. 



