Southampton Island. It is the largest island in the bay. The 

 southwestern two-thirds of the island is relatively low, flat lime- 

 stone country with sloping terraces marking the ancient beaches, 

 and broad belt of shoal ground fringing the coast. The northeast- 

 ern portion is difficult of approach because it is frequently blocked 

 by drift ice from Foxe Channel. The land in the northeast rises 

 abruptly from the limestone plain into rugged mountains with 

 altitudes of 1,000 to 1,500 feet. Sou<-hamp<-nr Island, together 

 with Coates and Mansel Islands to the southeast, form the northern 

 limit of Hudson Bay. The latter islands are of low relief. 



The Ungava Peninsula lies to the east of Hudson Bay and is 

 mainly a rolling plateau with low, bare, rocky hills, and broad 

 valleys containing unnumbered lakes and streams. The low areas 

 are covered with glacial fills of boulders and gravel. The plateau 

 rises rather abruptly from a narrow coastal plain along Hudson 

 Baj^ to heights of 1,000 to 2,000 feet, and slopes gradually down- 

 ward to the northeast to Ungava Bay. 



Figure 2-1 4. — Baffin Island, fourth largest in the world. 



44 



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