128 The Rev. W. Conybeare on the 



ern extremity of the chain is the highest summit, it rises 1820 feet 

 above the level of the sea ; but the basis of this mountain is occupied 

 to the height of 500 feet by primitive rocks, (connected with that 

 district of mica slate which has been before mentioned as appearing 

 in this part of the country) leaving only 1320 feet for the thickness 

 of the secondary strata peculiar to this system. Diris hill, near the 

 southern extremity of the chain, is wholly composed of those strata 

 and attains an elevation of 1475 feet above the sea : it is situated 

 about two miles to the west of Belfast. 



On the S.E. this chain pours several small streams into Belfast 

 Lough, and on the N.E. into the North Channel ; all these have a very 

 short course. On the west three rivers of rather more importance 

 take their rise ; the six mile water and the river Main which flow 

 into the bay of Antrim in the N.E. angle of Lough Neagh ; and the 

 Bush which empties itself into the ocean a little west of the Giants 

 Causeway. 



The western chain included between the Roe and the Bann forms 

 the exact counterpart of the former, but the strata here dip in a 

 nearly contrary direction, namely, towards the north-east ; the fall 

 of the hills being gradual in this direction, while they front the west 

 and south with abrupt and precipitous escarpments. Cragnashoack 

 at the southern extremity, is as might be expected from this general 

 inclination of the line, the highest summit, it rises 1864 feet above 

 the sea, exceeding by 44 feet the loftiest point of the eastern chain. 

 Slieve Gallion, an insulated hill which stands in an advanced position 

 at some distance from the south bank of Cragnashoack is less elevated 

 by 240 feet. 



Benyavenagh, the extreme mountain on the north, is one of the 

 lowest in the chain, rising only 1114 feet. 

 , The Roe, the Clady, and Aghivey, are the principal water courses 



