103,000 square kilometers

Photo from Wikimedia Commons
Iceland
The volcanic island nation straddling the Mid-Atlantic Ridge/Islands
Iceland sits on the Mid-Atlantic Ridge in the North Atlantic, making it one of the most geologically active places on Earth. The island covers 103,000 square kilometers and features active volcanoes, geysers, hot springs, lava fields, and glaciers, often in close proximity. Vatnajokull, Europe's largest glacier by volume, shares the island with over 30 active volcanic systems. About 85% of Iceland's energy comes from geothermal and hydroelectric sources, making it one of the greenest energy economies in the world.
Measurements
Maximum width
Maximum length
On the rim of Oraefajokull volcano
About 11% of the island
Deeply indented by fjords