
Tönnönkoski on the Porvoonjoki is a small rapids and riverside stretch offering textured water motion, mossy rocks and tree-lined banks—great for long exposures, seasonal colour (autumn foliage, spring thaw) and intimate landscape frames. Easily reached from Siltakuja with roadside parking nearby; no entry fees. Best at golden hour or blue hour for soft side light and reflections. Winter brings ice formations; avoid high water after heavy rains. Quiet weekdays reduce walkers and anglers.

Tönnönkoski on the Porvoonjoki is a small rapids and riverside stretch offering textured water motion, mossy rocks and tree-lined banks—great for long exposures, seasonal colour (autumn foliage, spring thaw) and intimate landscape frames. Easily reached from Siltakuja with roadside parking nearby; no entry fees. Best at golden hour or blue hour for soft side light and reflections. Winter brings ice formations; avoid high water after heavy rains. Quiet weekdays reduce walkers and anglers.