i dont think cumberland is the 2nd largest man made lake in the world...
aswan in egypt is currently the largest, and lake mead is much larger than cumberland, that off the top of the head, cant think of anymore right now, but at best its 3rd. anyone heard about the dam under construction in china on the huang ho??? saw a show last week on the sci channel, this new lake slated to be complete in 2010 will dwarf all others with a surface area around
20000 sq miles thats almost 30 times the size of okeechobee.