Dynjandi is Iceland's most celebrated waterfall outside the golden circle, and arguably more impressive than most of them. It falls from a high plateau in a wide, fan-shaped curtain — broadening as it drops — before breaking into a sequence of smaller falls that continue to the fjord shore below. The walk from the car park at the base to the top of the main fall takes about 20 minutes and passes each of the lower falls in turn; the trail is well-maintained and the views across the fjord improve with every hundred metres of height.
The setting is the thing. Most Icelandic waterfalls sit near roads and crowds. Dynjandi is at the head of Arnarfjörður in the south Westfjords, a long, deep fjord with barely any traffic. From the viewpoint above the main fall, you look out over still fjord water with mountains on both sides and possibly no other people in sight. The falls are accessible in summer and can be reached from Ísafjörður in about two hours.