Plenty cities are located where rivers meet, however I'm struggling to think of any where a major river splits?
The Orinoco River and Rio Negro are connected via a distributary, although this is the upper reaches of both rivers.
Deltas are commonly very large and involve several streams. The mouth of the Amazon River is more or less 100 miles distant. And the Brahamaputra and Ganges river delta involves 100s of channels that more or less crisscoss the entirety of Bangladesh.