Elle prend une source modeste sous les frondaisons de la forêt de Saint-Sever (Calvados) et se jette dans la Manche au havre de Regnéville-sur-Mer. Elle est longue de 76 km.
Le Gast, Fontenermont, Saint-Aubin-des-Bois, Saint-Maur-des-Bois, Boisyvon, Saint-Denis-le-Gast, les Mesnils : autant de sylvestres noms significatifs du pays traversé.
Au sortir de Villedieu, la vallée accuse un relief assez tranché : succession de croupes boisées et éventuellement garnies de bruyères.
Chargement de la carte...
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(fleuve)","GeoJsonRevisionId":639063,"imageLayers":[],"locations":[],"imageoverlays":null}
La Sienne doit rester propre : elle fournit quatre stations de pompage qui alimentent le réseau en eau potable [2].
Le Siaes, présidé par Stéphane Villaespesa, emploie trois techniciens de rivière, trois techniciens d'entretien et un administratif sur un mi-temps[3].
Ce dernier rapprochement est repris par François de Beaurepaire qui associe également le nom de la Sienne à celui de la Sélune (Senuna ~850) [30], négligeant cependant de mentionner celui de la Sénène, qui est un affluent rive droite de la Sienne. L'auteur se borne ensuite à citer, sans l'expliciter, une « racine hydronymique sen » ou « racine indo-européenne sen » (comprendre °sen-), que l'on croit retrouver dans divers toponymes tels que Sénonnes (Mayenne), Senones (Voges), rapprochés du nom des Gaulois Senones, et Senonches (Eure-et-Loir), Senonges (Vosges) < °SENONICAS [30]. Le fait est que l'on reste un peu sur sa faim.
Cette deuxième racine, évoquant la séparation ou l'exclusion, est à l'origine, entre autres, du latin sine « sans » (d'où le français sans) ou encore de l'anglais to sunder « séparer ». On pourrait donc considérer que les hydronymes en Sen- (ou du moins, certains d'entre eux) sont des marqueurs de limites. Cependant, le cours de la Sienne ne correspond pas à la frontière entre les Abrincates et les Unelles, qui passait nettement plus au sud. Faire l'hypothèse d'un tracé antérieur de la frontière ou d'une limite de pagus à cet endroit ne repose sur rien de concret, en l'état des connaissances actuelles. Aussi paraît-t-il plus prudent de se limiter pour l'instant à la première explication.