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.
Watching a geyser erupt, even a small one, is a fascinating sight. 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.
Here is some of most stunning Icelandic geysers.