Short answers, pulled from the story.
The Gardon begins its journey in the commune of Saint-Martin-de-Lansuscle within the Cévennes mountain range. The furthest source point is located at the Gardon de Saint-Jean tributary before forming a 133-kilometer path toward the sea.
Record-breaking floods struck the Gardon in September 2002 with violent force and water levels higher than any previous measurement. A second major flood event occurred again in December 2003 causing significant structural damage to many bridges along the course.
Cities like Anduze and Saint-Jean-du-Gard line the banks of the main stream of the Gardon river. Other towns including La Grand-Combe and Alès sit directly upon the Gardon d'Alès tributary which flows into the main channel.
Paddlers departing from Collias reach the Pont du Gard in about an hour and a half during the season. Late June brings low river levels that sometimes prevent passage under the Pont du Gard for kayakers and canoeists.
The Gorges du Gardon end precisely where the Pont Saint-Nicolas spans the water further downstream from the Pont du Gard aqueduct. This 16th-century bridge crosses the river at a point north of Beaucaire directly across from Vallabrègues.