Late 13th century origins in Haukadalur
Source descriptions place Great Geysir's emergence around the late 13th century, in a period of strong earthquakes and volcanic unrest tied to Mt. Hekla. That deep geothermal background is why the valley still feels active far beyond a single vent.
1916 and 1935: turning-point years
In 1916, Great Geysir stopped regular activity. A brief reactivation followed in 1935, but long dormancy returned. Earlier reports describe eruptions reaching 60 to 80 m (197 to 262 ft), which explains the site's enduring global fame even today.
A global word from one Icelandic name
The English term "geyser" comes from the Icelandic name geysir, meaning a gusher. Few natural sites shape everyday language this directly. That linguistic legacy keeps Great Geysir relevant even when the active show is led by another vent nearby.
Why Strokkur leads the live spectacle
About 100 m (328 ft) south of Great Geysir, Strokkur now delivers the regular eruptions, usually around every 10 minutes and up to about 30 m (98 ft). In practice, visitors come for that repeat rhythm, while Great Geysir remains the symbolic heart of the field.