Thjorsardalur Valley, in south Iceland near the Highlands, has an abundance of natural wonders including Hekla (one of Iceland's most active volcanoes), Gjain (a fairytale-like oasis of small rivers, lava formations, ponds and waterfalls (see Gallery), Hjalparfoss (a waterfall with the conjoining of the Thjorsa and Fossa rivers), and Haifoss and Granni (two of Iceland's tallest and most dramatic waterfalls).