The site was once part of the output from the Rieulay coal mine, which operated until the late 20th century.
The hill reaches an elevation that provides a panoramic view of the surrounding Scarpe-Escaut Regional Natural Park.
The central lake formed as a result of subsidence and groundwater seepage after mining operations ceased.
It is part of a larger network of mining heritage sites protected under UNESCO World Heritage status.
The area is now an officially recognized bird-watching site due to the diverse avian species it attracts.
The slopes are used to test reforestation techniques on post-industrial soil.
Terril des Argales is a former coal mining spoil tip in Rieulay that has been transformed into a large natural park and leisure site. Despite being categorized as a zoo in the provided database, the site is actually a sprawling landscape park featuring a lake and nature trails, though it is not a traditional zoological garden. It remains a key landmark of the UNESCO-recognized Nord-Pas de Calais Mining Basin. The terrain consists of a 140-hectare mound reclaimed by local flora and fauna. Visitors can traverse extensive paths that circumnavigate the site's central water body. It serves as an educational space highlighting ecological restoration and the history of regional industrial activity.
The summit viewing point looking over the lake and the neighboring pastoral landscape.
Wear sturdy, closed-toe walking shoes as the trails consist of crushed shale and gravel.
Bring binoculars if you are interested in ornithology, as the lake attracts migratory birds.
Check the local wind conditions before visiting, as the elevated sections of the terril can be quite exposed.
Attempting to climb the steeper, non-maintained slopes, as they are prone to erosion and are fenced off for safety.
Open year-round, but specific trails may be restricted during periods of heavy rain or maintenance.
Keep dogs on a leash at all times to protect local wildlife; do not disturb vegetation or remove coal samples.
