Canada

	The large annular lake in this image represents the remnants of one of the largest impact craters still preserved on the surface of the Earth. Lake Manicouagan in northern Quebec, Canada, surrounds the central uplift of the impact structure, which is about 70 kilometers in diameter and is composed of impact-brecciated rock.... ....read more
	From the time Europeans discovered the North American continent to the mid-twentieth century, sailors searched for a northwest passage that would connect the Atlantic Ocean (and Europe) to the Pacific Ocean (and Asia). No such passage exists through the continent, but during the summer, a northwest route through the Arctic opens up..... ....read more
	Seven Island Bay (left side of the image) is one of the largest and best-protected harbors on Quebec’s north shore of the Gulf of St. Lawrence (Canada). Because this is both a deep-water port and ice-free year round, ..... ....read more
	The Saskatchewan River watershed extends from the Rocky Mountains of Alberta through the plains of Saskatchewan and Manitoba to the east. Flooding of the Cedar Lake basin following the construction of the Grand Rapids Dam in the 1960s created shallow, muddy lakes and bogs..... ....read more