du Rhone is only a part of the Rhone
du Rhone is a wine appellation (wine name) in the
Rhone valley. It is actually the biggest one with
a total production of 250 million bottles of wine.
du Rhone spreads in the Southern region of the Rhone
valley. Wine in Cotes du Rhone is usually red and
appellations in the Rhone are Hermitage, Chateuneuf
du pape, Cote Rotie, Cotes du Ventoux among others.
is also a "Cotes du Rhone Villages" appellation
which is different from Cotes du Rhone. The Villages
wines are supposedly better.
more about Rhone Valley and Cotes
your question here