Ardèche is a tributary of the river that has a mouth at what body of water?
Rhône The Rhône ( ; French: "Le Rhône" ] ; German: "Rhone" ] ; Walliser German: "Rotten" ; Italian: "Rodano" ] ; Arpitan: "Rôno" ] ; Occitan: "Ròse" ] ) is one of the major rivers of Europe and has twice the average discharge of the Loire (which is the longest French river), rising in the Rhône Glacier in the Swiss Alps at the far eastern end of the Swiss canton of Valais, passing through Lake Geneva and running through southeastern France. At Arles, near its mouth on the Mediterranean Sea, the river divides into two branches, known as the Great Rhône (French: "Le Grand Rhône") and the Little Rhône ("Le Petit Rhône"). The resulting delta constitutes the Camargue region.
Arras Arras ( ; ] ; Dutch: "Atrecht" ) is the capital ("chef-lieu"/préfecture) of the Pas-de-Calais department, which forms part of the region of Hauts-de-France; prior to the reorganization of 2014 it was located in Nord-Pas-de-Calais. The historic centre of the Artois region, with a Baroque town square, Arras is located in Northern France at the confluence of the Scarpe river and the Crinchon River.