One of the biggest draws for the area is Reykjadalur (literally "Steam Valley), an extraordinary geothermal valley that provides visitors sweeping views peppered with plumes of steam, bubbling mud pots and wide spots in the thermal river perfect for taking a mid-hike dip.
Unlike many geothermal areas in Iceland, Reykjadalur is relatively accessible and the hike through the valley is not terribly difficult. The river that flows through the valley is quite long, so you can typically find a spot all to yourself to take a dip. You can regulate the temperature somewhat by moving along the river. The further upstream you travel, the warmer the water.
Two of the most remarkable views are out over the Djúpagil ravine with the Djúpagilsfoss waterfall and, at the other end, Klambragil canyon with its steam vents and bubbling mud pots. These are both places to stop and take in the magnificent beauty of this region.
And now a word of warning: it’s crucial to stay on the paths when hiking in Reykjadalur. The entire area is criss-crossed with geothermal waterways, some hidden by vegetation or outcroppings. When you leave the path, you run the risk of stepping into a bubbling mud pot or hot spring, which can result in serious injury. So play it safe and always stick to the path. And when choosing a spot to soak in the thermal river remember to dip a toe before you take the plunge!