The first three that come to mind are Nile, Hudson, and Mississippi. The Yellow River, Volga River, and Ganges River Deltas are pretty famous.
Well I don't know the exact answer as I am studding this 4 school at the moment I have found the the yellow river delta is the second biggest river in china and the delta is over 8000 sq km hope this helps you
The niles delta is the most common know sorry thats all I know I'm only in secondary skool
The deltas of world