C. Julius Caesar, Gallic War

The Meuse rises from mount Le Vosge, which is in the territories of the Lingones ; and, having received a branch of the Rhine , which is called the Waal , forms the island of the Batavi, and not more than eighty miles from it it falls into the ocean. But the Rhine takes its source among the Lepontii, who inhabit the Alps , and is carried with a rapid current for a long distance through the territories of the Sarunates, Helvetii, Sequani, Mediomatrici, Tribuci, and Treviri , and when it approaches the ocean, divides into several branches; and, having formed many and extensive islands, a great part of which are inhabited by savage and barbarous nations (of whom there are some who are supposed to live on fish and the eggs of sea-fowl), flows into the ocean by several mouths.