The trail past the graffiti turns into a pleasant walk along a rocky watercourse – presumably the River Drize. The path was largely flat and shaded by trees. Benches (as seen in the picture above) have been placed along the way in case you need to rest.

According to the French version of Wikipedia (translated from the original French):

8.9 km long, the source of the Drize is at the foot of the Salève, more precisely in the territory of the commune of Archamps. It then crosses the communes of Bossey and Collonges-sous-Salève before entering Switzerland (where it takes its name) by the commune of Bardonnex. It then crosses or borders the towns of Troinex, Veyrier, Lancy, Plan-les-Ouates, Carouge and eventually Geneva to plunge into the Aire at an altitude of 390 meters.

The Drize arises from several tributaries, the main ones being the Tate brook (or Archamps brook) and the Clef stream (or Collonges brook). Thereafter, on the Geneva territory, it still receives three tributaries: the Nant-de-Sac, the Bistoquette and the creek of the Marais.

The first mention of the Drize dates back to 1780, during the construction of the Carouge Canal, which diverts part of the river to feed these factories. Around 1790, the marshes of Troinex are partially drained.

Beginning in 1934, the course of the river was gradually tamed, first by vaulting it at the junction with the Aire, then by several successive drainages in the Bardonnex and Charrot zones (between 1941 and 1945 ) Then Troinex and Croix-de-Rozon (1945 to1983).

In 1967, the industrial wastewater treatment plant in Aïre was commissioned and received waste water from the Drize River in 1970. In 1992, the other waste water treatment plant on the river at Collonges-sous-Salève, is de commissioned.

From 1997 onwards, major works were undertaken to clean up the river banks, to uncover part of the Bistoquette and to create a new tributary (Tatte ditch) with the general aim of revitalizing the river and its banks. As of 2003, these projects have been extended to both sides of the border by signing the cross-border river contract (10 October 2003)

Rocks in the River.

A shady walk

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