Sequana

SE´QUANA(Σηκουάνας, Σηκοάνας, Ptol. 2.8.2), the Seine, one of the large rivers of Gallia. The Seinerises in the highlands south of Langres, but in the department of Côte d'Or, and flows in a northwest direction past Châtillon-sur-Seine, Troyes, Meleun, Paris, Mantes, Elboeuf, Rouen, and Le Havre. It enters the Atlantic below Le Havre. The course of the Seineis about 470 miles, and the area of its basin is about 26,000 English square miles, which is only one half of the area of the basin of the Loire. The chief branches of the Seinewhich join it on the right bank are the Aube, the Marne, and the Oise;on the left bank, the Yonne, the Loing, and the Eure.None of the hills which bound the basin of the Seine, or are contained within it, have a great elevation, and a large part of the country included within this basin is level.
Caesar ( B. G. 1.1) makes the Sequana and the Matrona ( Marne) the boundary between the Celtae and the Belgae. Strabo (4. p. 192) says that the Sequana rises in the Alps, a statement which we must not altogether impute to an erroneous notion of the position of the river's source, though his knowledge of Gallia was in many respects inaccurate, but to the fact that he extended the name of Alps far beyond the proper limits of those mountains. But his inaccuracy is proved by his saying that the Sequana flows parallel to the Rhine, and through the country of the Sequani. He is more correct in fixing its outlet in the country of the Caleti and the Lexovii. The Seinewas navigated in the time of Strabo and much earlier. [GALLIA TRANSALPINAV ol. I.]
The Mátrona, as Ausonius names it (Mosella, 5.462),— Matrona non Gallos Belgasque intersita fines,—joins the Seinea few miles above Paris;it is the largest of the affluents of the Seine.
Ammianus Marcellinus (Ammian. 15.11) says that the united streams of the Sequana and Matrona entered the sea near Castra Constantia ( Coutances), which is a great mistake. In the cosmography of Aethicus the Sequana is named Geon or Geobonna.
[G.L]