The Westfjords are Iceland's oldest landmass, with no active volcanoes for the last 10 million years. Glaciation created more than half of Iceland's fjords but little lowland suitable for agriculture. The central coastal region of the Westfjords -- boundaried by Arnarfjörður to the south and Ísafjarðardjúp to the north -- is particularly mountainous and , and in winter, roads to neighboring towns can be cut off for days at a time. Highlights of this area include Dynjandi, the largest and most resplendent waterfall in the Westfjords; the "Westfjords Alps," a prime hiking area; and the village of Suðureyri, where locals invite visitors to experience the fishing life.