As you admire the views while your ship glides up the Geirangerfjord, you may get the impression that the massive gray rock walls rising above you are marbled. But look more closely and you’ll see that the white veins are really waterfalls. All along the way, fresh mountain streams spill over the cliff tops to plunge into the fjord. Some falls are just a trickle; others are torrents. Watch for the famous Seven Sisters Waterfalls, and have your camera ready. During periods of heavy snowmelt (usually between May and July), the seven streams are an especially powerful sight.