Songs about water such as oceans, lakes, rivers etc.

Waterfall         ELO

Delta Lady:  Joe Cocker

Many rivers to cross    Joe Cocker

Erie Canal:  Bruce

The Ocean-Led Zeppelin 

Bridge Over The River Kwai:  Mitch Miller

The Great Salt Lake:  Band Of Horses

Down by the sea    Nilsson

My Bonnie Lies Over The Ocean:  Beatles

Wade In The Water:  Ramsey Lewis Trio