Védomagne Delta
The Védomagne Delta (savamese: le delta de la Védomagne) is the river delta in north-eastern Savam where the Védomagne river, the largest river in Messeno-Joriscia, drains into the Arcedian Sea. The delta can also largely be referred to as the region of Jalmédie as the two terms are almost synonymous in Savam. The overall region is known as Lower Védomagne.
Geography
From Belny at the initial split the delta extends over 160 km to the sea along the course of the Grand Ru, the Védomagne's main branch. The Petit Ru flows directly north from the split to the sea over a shorter 95 km course. Most of the delta is comprised between the two branches, except in the furthest course of the Grand Ru where the delta extends outward to the east; at the widest it is approximately 85 km across. The approximate total surface area is x,xxx km².
The smaller xxxx river joins the Grand Ru at the mid point of its course inside the delta 55 km north-east of Belny; the xxxx (forming the boundary between Savam and Transvechia) also empties in the Étang xxx, one of the delta's several lagoons.
Wetlands
The delta hosts some of the largest wetlands in Messeno-Joriscia, including the largely preserved Marshes of Jalmédie in the delta's north-eastern quarter along the Grand Ru. A protected natural park, the Marshes of Jalmédie are an important biodiversity hot-spot in Savam despite the pollution carried by the river from inland.
The wetlands of Lower Védomagne used to extend far south but most of these have been drained as the region transformed into an agricultural powerhouse. Védomagne floods used to play an important role in fertilisation the region, but various works of regulation have rendered this natural effect less important. In 1981 the Dordanian Environment Protection Magistracy inaugurated a special barrier 12 km downstream of Belny on the Grand Ru which purpose is to remove larger floating pollutants (such as pieces of plastic or metal) and prevent them from reaching the marshes.
River engineering
The Petit Ru has been straightened and canalised in several stages since the 17th century in order to support boat traffic between Belny, a major trading centre, and the deep water port of Lèz-les-Sablons built at the Petit Ru's mouth on the Fulvian Gulf coast.