
Cascata Santa Petronilla IV is a compact waterfall on the Biasca side of the Blenio Valley—ideal for intimate cascades, misty texture, and layered rocks. Visit in spring–early summer for strong flow; autumn offers moody light with fewer crowds. Good for quick stop-offs with roadside access and short walks along the water.

Cascata Santa Petronilla IV is a compact waterfall on the Biasca side of the Blenio Valley—ideal for intimate cascades, misty texture, and layered rocks. Visit in spring–early summer for strong flow; autumn offers moody light with fewer crowds. Good for quick stop-offs with roadside access and short walks along the water.