Columbia River
The Columbia drains an area of about . Its drainage basin covers nearly all of Idaho, large portions of British Columbia, Oregon, and Washington, ultimately all of Montana west of the Continental Divide, and small portions of Wyoming, Utah, and Nevada; the total area is similar to the size of France. Roughly of the river's length and 85 percent of its drainage basin are in the US. The Columbia is the twelfth-longest river and has the sixth-largest drainage basin in the United States. In Canada, where the Columbia flows for and drains , the river ranks 23rd in length, and the Canadian part of its basin ranks 13th in size among Canadian basins. 
The Columbia shares its name with nearby places, such as British Columbia, as well as with landforms and bodies of water.
Petitcodiac River
Six species have disappeared from the river since the mid-1980s. The Petitcodiac River was the only known Canadian habitat of the dwarf wedgemussel, and was later isolated to just nine American watersheds after its elimination from the Petitcodiac. The Atlantic salmon is no longer present in the watershed, and has since been listed as an endangered species in Canada. The American shad was a favourite with fishermen, and represented two-thirds of the entire Canadian shad landings from 1870 to 1900; catches peaked at  million kilograms (two to six million pounds) per year. Three other species have been eliminated from the river: the striped bass, the Atlantic sturgeon, and the Atlantic tomcod. However, a project of the Petitcodiac Riverkeeper, funded by the Government of Canada's Environmental Damage Fund in 2005, noted that the removal of the causeway would result in a "good" chance of bringing back the eliminated species, and an "excellent" chance of increasing the numbers of species deemed to have been reduced in numbers. No data has been released for the Atlantic salmon or the striped bass.