123 



Topography. 



Glacier bay is a broadly open fiord between the Fair- 

 weather range and the mountains on the western side of 

 Lynn canal. It is about 4 miles (6.4 km.) broad at the 

 mouth, widens to about twice this breadth, and then 

 branches. One arm, Muir inlet, extends due north about 



Excursion C 8. 



Relief map of Glacier bay and Lynn canal. 



15 miles (24 km.) to the ice cliffs of Muir glacier, which 

 surround its head, and the other arm extends northwest- 

 ward for 35 miles (56 km.) where it is terminated by the 

 Grand Pacific glacier. The latter arm is branching, with 

 six good-sized tributary fiords also terminated by tidal 

 glaciers. The extreme length of the bay from its mouth 

 to the tidal front of Grand Pacific glacier is over 60 miles 



