Austurland (eastern region) with its largest town Egilsstaðir is home for a jagged coastline of Austfirðir (Eastfjords). In addition, there are glaciers - Svinafellsjokull and Vatnajökull (the largest in Iceland covering 9% of the country and part of Vatnajökull national park), horn shaped mountains - Vestrahorn, Jökulsárlón glacier lagoon, waterfalls Svartifoss (in Skaftafell national park), Sveinsstekksfoss, Folaldafoss, Rjukandi, and an iconic town of Seydisfjordur with rainbow painted streets.
Norðurland (comprising of Norðurland eystra and Norðurland vestra regions) with towns of Akureyri and Sauðárkrókur is home for several incredible wonders: Hverir geothermal fields, Mývatn geothermal area surrounding Lake Mývatn, caldera of Krafla volcano, a kilometer wide Hverfjall crater, pseudo-craters in Skútustaðagígar, Hofdi nature reserve, the basalt rock Hvítserkur and gigantic waterfalls of Dettifoss and Hafragilsfoss, and Selfoss.
Vesturland (western region) with its largest town of Akranes, is famed for Snæfellsjökull National Park and its several iconic spots: Kirkjufell mountain, black-pebbled Djúpalónssandur and Dritvík beaches, Londrangar basalt cliffs, coastal villages of Arnarstapi and Hellnar, Gerðuberg cliffs, Eldborg Crater, and numerous waterfalls: Barnafoss, Kirkjufellsfoss, Glymur, Hraunfossar and Bjarnarfoss.
Reykjavik, the world’s northernmost capital, is the most populated of Icelandic regions.
Golden Circle (derived from the name of Gullfoss - golden waterfall), is not actually a region, but a tourist route in southern Iceland, covering about 190 mi looping from Reykjavík to Þingvellir National Park, the Gullfoss waterfall, the geothermal area in Haukadalur (which contains the geysers Geysir and Strokku), the Kerið volcanic crater, and the town of Hveragerði.
Suðurland (southern region) with its largest town Selfoss encompasses most of the Golden Circle. In addition, there are waterfalls - Seljalandsfoss, Gljúfrabúi and Skogafoss, Eyjafjallajökull volcano, sand beaches of Vik (and awesome views nearby from Dyrhólaey, Kirkjufjara and Reynisdrangar), Eldhraun lava field, and 2 million old river canyon of Fjaðrárgljúfur.