Old Faithful of Yellowstone National Park may be the most famous geyser in the world, the second most famous geyser in Iceland is Strokkur, which erupts every 8 minutes throwing a column of water and steam to a height of 20 metres or so.

There are several other smaller geysers in Iceland.

Geysers are found in active volcanic areas or land that is prone to earthquakes.

Thermal or hot springs are also a feature, as are boiling mud pools, often appreciated for their medicinal qualities.

The powerhouse of a geyser lies deep underground, where surface water seeps through fissures and collects in caverns. The temperature of the surrounding volcanic rock, at around 200 °C, heats the trapped water, causing it to expand into steam and force its way up and out.