Hreggnasi Canyon, IcelandHreggnasi Canyon is a narrow basalt gorge in the Icelandic highlands, and catching it under the right sky makes all the difference. The river runs shallow here between dark volcanic walls, rounded rocks filling the streambed like they've been tumbled for centuries. Which they have. I was fortunate with the timing on this one. The sky cracked open just above the horizon, flooding the canyon with pink and red light while everything else stayed dark and