Lónsöræfi (Icelandic pronunciation:[ˈlounsˌœːrˌaiːvɪ]) is a wilderness area in south-east Iceland. The region is characterised by its varied geological formations.[citation needed] These mostly date from a period between 5 and 7 million years ago, when the volcano Kollumúlaeldstöðvar[ˈkʰɔtlʏˌmuːlaˌɛltˌstœðvar̥] was active.[citation needed] The glacier tongues of the eastern extreme of Vatnajökull also impose themselves on the area. Visible to the north-west is Snæfell [ˈstnaiːˌfɛtl̥] (1833m), the highest peak in Iceland that isn't part of a glacier. The mountains within the area itself include Sauðhamarstindur [ˈsœyðˌhaːmar̥sˌtʰɪntʏr̥] (1319m) and Jökulgilstindar [ˈjœːkʏlˌkɪlsˌtʰɪntar̥] (1313 m).