Nile River (Africa)
Amazon River (South America)
Ganga River (India)
Yangtze River (Asia)
Mackenzie River (North America)
Danube River (Europe)
Niger River (Africa)
Hudson River (North America)
Mississippi River (North America)
Yellow River - China (Asia)
Thats the top 10, I'm not sure of twelve, but if you type those individually into Google or a search engine, you can probably get all the details on fact pages.
Another may be the Murray River in Australia?
And for the lakes, just google them also, and get their facts on temperature!!
Good luck, hope this helps!