Seymaz

Seymaz
The Seymaz near Bel-Air , Thônex
Data
Water code	CH : 3856
location	Canton of Geneva , Switzerland
River system	Rhône
Drain over	Arve  → Rhône  → Mediterranean
Headwaters	near Vésenaz, Collonge-Bellerive 46 ° 14 ′ 31 ″  N , 6 ° 13 ′ 9 ″  E
Source height	approx.  430  m above sea level M.
muzzle	Between Chêne-Bougeries and Chêne-Bourg in the Arve Coordinates: 46 ° 10 ′ 47 ″  N , 6 ° 10 ′ 54 ″  E ; CH1903:  502.94 thousand  /  115037 46 ° 10 '47 "  N , 6 ° 10' 54"  O
Mouth height	approx.  389  m above sea level M.
Height difference	approx. 41 m
Bottom slope	approx. 2.7 ‰
length	15.2 km
Catchment area	36.5 km²
Drain	MQ	350 l / s

The Seymaz is a 15 km long tributary of the Arve in the Swiss canton of Geneva . It is the only river that runs exclusively in the area of ​​the canton of Geneva. The Seymaz drains an area of ​​38.43 km².

course

The Seymaz rises in the area of ​​the municipality of Collonge-Bellerive east of Lake Geneva , but shortly afterwards it crosses over to the Meinier area . The river initially runs in a south-easterly direction to the confluence of the Chambet stream , which rises in the woods near Gy . After its confluence, the river now flows in a south-westerly direction and immediately afterwards takes on the small stream Chamboton . It flows through the municipality of Choulex and forms its outermost southwestern border with Puplinge . A little later it leaves the area of ​​the municipality of Choulex and now forms the border of Vandœuvres with the municipality of Thônex and a little later a small part with that to the municipality of Chêne-Bourg . The river, which now runs in a southerly direction, leaves Vandœuvres and now forms the border between Chêne-Bourg and Chêne-Bougeries until it flows into the Arve.

Individual evidence

1. ↑ ^{a b c} individual records on the geoserver of the Swiss federal administration
2. ↑ Hydrological Atlas of Switzerland of the Federal Office for the Environment FOEN, Table_13