Bulken Wave is a classic natural standing wave on the Vosso River just outside Voss, Norway, framed by the steep mountain scenery that makes this whole region an extreme-sports hub. It's one of the best-known river surf spots in Scandinavia, with enough push to keep intermediate surfers engaged without demanding expert-level commitment. Flows depend on snowmelt, so the wave is primed in spring and summer—roughly April through August—and can fade once the glacial melt tapers off. Voss makes an easy base, with kayakers and surfers often sharing the wave on good days.