Three Rivers, or One?

It seems that Trois-Rivières is not really three different rivers. From Wikipedia:
"The city's name, which is French for three rivers, is named for the fact that the Saint-Maurice River, which is divided by two small islands at the river's opening, has three mouths at the Saint Lawrence River."

From Canadian Geographic Magazine:
"the dark iron-rich waters of Rivière Saint-Maurice can be seen swirling like a watercolour wash into the green flow of the St. Lawrence River. A sandy beach fringes Île Saint-Quentin, at the mouth of the Saint-Maurice, and crisp white sails punctuate the river’s three channels, which form a delta and long ago inspired a French captain to give the area its misnomer, Trois-Rivières (“Three Rivers”)."

Mistaken identity aside, the name Trois-Rivières is much more elegant than Une-Rivière.