The Gorges du Verdon aren't the only canyons to explore in this part of France. Lying 18km east of Rustrel, the Gorges d'Oppedette is a system of gorges gouged out from the limestone over the millennia by the Calavon River. Several marked trails wind though the gorges, lasting from around half an hour to three hours; the tourist office in Apt has route leaflets.
It's a gorgeous and quiet area to explore, and the canyons' high walls ensure they remain mercifully cool even on a blazing August day. Pack a picnic, and hiking boots.
The small car park is signed off the D201 as you travel north from Viens towards Simiane-la-Rotonde.