Section A Exploring the World Text AA Brief Introduction to Canada Note Geography and Climate Canadalll occupies a major northem portion of North Americal21,sharing land borders with the contiguous United States to the south and the U.S.state of Alaska to the northwest,stretching from the Atlantic Ocean in the east to the Pacific Ocean in the west;to the north lies the Arctic Ocean.By total area(including its waters),Canada is the second largest country in the world after Russia and largest on the continent. In northwestemn Canada,the Mackenzie River flows from the Great Slave Lake to the Arctic Ocean.A tributary of the Mackenzie is the South Nahanni River,which is home to Virginia Falls,a waterfall about twice as high as Niagara Falls31. To the north of this region is the broad Canadian Shield,an area of rock scoured clean by the last ice age, thinly soiled,rich in minerals,and dotted with lakes and rivers.Canada by far has more lakes than any other country and has much of the world's fresh water. 大连理工大学出版社大连理工大学出版社 Section A Exploring the World Text A A Brief Introduction to Canada Geography and Climate Canada[1] occupies a major northern portion of North America[2] , sharing land borders with the contiguous United States to the south and the U.S. state of Alaska to the northwest, stretching from the Atlantic Ocean in the east to the Pacific Ocean in the west; to the north lies the Arctic Ocean. By total area (including its waters), Canada is the second largest country in the world after Russia and largest on the continent. In northwestern Canada, the Mackenzie River flows from the Great Slave Lake to the Arctic Ocean. A tributary of the Mackenzie is the South Nahanni River, which is home to Virginia Falls, a waterfall about twice as high as Niagara Falls[3] . To the north of this region is the broad Canadian Shield, an area of rock scoured clean by the last ice age, thinly soiled, rich in minerals, and dotted with lakes and rivers. Canada by far has more lakes than any other country and has much of the world’s fresh water. Note