The route leaves Cazorla and follows the A-319 all the way. It first climbs to the Puerto de las Palomas, then drops into the Guadalquivir valley via Arroyo Frío and continues downstream to El Tranco, beside the reservoir dam. It is the main road crossing the natural park from south to north, and a good way to see the sierra without leaving tarmac.
The route passes through the municipalities of Cazorla, La Iruela, Santo Tomé, Santiago-Pontones and Hornos, inside the Sierras de Cazorla, Segura y Las Villas Natural Park, where the Guadalquivir rises. The climb to the pass gives wide views over the olive-covered countryside, and on the other side the road enters a valley of pine forest and crags that follows the river to the Tranco reservoir. The bends are constant and the ride is more about enjoying the scenery than going fast.
It is about 61 km, with an estimated riding time of just over an hour and a half without stops. Altitude ranges from around 620 m to around 1,250 m at the Puerto de las Palomas. This is a busy protected area, so expect cars, motorhomes and cyclists, as well as wildlife on the road, especially at dawn and dusk. The calculated route includes a token unsurfaced stretch of about 100 metres.