Canada–France–Hawaii Telescope...

 The CFH observatory hosts a world-class, 3.6 meter optical/infrared telescope. The observatory is located atop the summit of Mauna Kea, a 4200 meter, dormant volcano located on the island of Hawaii. The CFH Telescope became operational in 1979. The mission of CFHT is to provide for its user community a versatile and state-of-the-art astronomical observing facility which is well matched to the scientific goals of that community and which fully exploits the potential of the Mauna Kea site.

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Pingualuit Crater Lake, Quebec, Canada...

 The Pingualuit Crater, formerly called Chubb Crater and later New Quebec Crater (cratere du Nouveau-Quebec), is a young impact crater, by geological standards, located in the Ungava Peninsula of Quebec. It is 3.44 km (2.14 mi) in diameter, and is estimated to be 1.4 ± 0.1 million years old (Pleistocene).

 The crater is exposed to the surface, rising 160 m (520 ft) above the surrounding tundra and is 400 m (1,300 ft) deep. A 267 m (876 ft) deep annular Pingualuk Lake fills the depression, and is one of the deepest lakes in North America. The lake also holds some of the purest fresh water in the world, with a salinity level of less than 3 ppm (the salinity level of the Great Lakes is 500 ppm). The lake has no inlets or apparent outlets, so the water accumulates solely from rain and snow and is only lost through evaporation. In terms of transparency, it is one of most transparent lakes in the world, with Secchi disk visible more than 35 m deep.

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Spotted lake, Osoyoos, Canada...