The Ponga arrives into the Sella network from the south, a slate-limestone mixed river with pronounced spate character. The upper reaches are step-pool through mixed lithology; the descent is steep and response immediate. The water carries both limestone clarity and slate amber tones blended. The middle Ponga opens into pool-riffle sequences on cobble; the pools are productive. The river's character maintains its responsive disposition throughout. The wading demands care in the upper step-pool sections, becoming more approachable as the river opens.

Wading: Polished wet limestone slabs at step lips