The ash plume that closed European airspace in April 2010 rose from a fissure barely a kilometre long. Before that spring, Eyjafjallajökull had been silent for 187 years. Its name is a stacked description rather than a title: eyja for islands, fjöll for mountains, jökull for glacier — the ice cap standing above the mountains that face the Westman Islands. A snowmobiling tour on Eyjafjallajökull Glacier now crosses the same white surface that carried that eruption's meltwater away. The cap spreads over roughly 80 square kilometres and hides a summit caldera about 2.5 kilometres wide, filled with ice measured in places at 200 metres thick. On the northern flank, the outlet glacier Gígjökull once spilled into a proglacial lagoon; the jökulhlaup of 2010 filled that lagoon with rock and ash within hours. Farms along the Markarfljót plain were evacuated, ash settled in centimetres on the fields below Route 1, and the plume climbed nine kilometres. Interest in glacier snowmobile excursions and in snowmobiling tour on Eyjafjallajökull Glacier tours dates almost entirely from that year. What holds attention now is less the eruption than the ice above it. Glaciologists treat the cap as a reference surface, resurveying it against the 2010 datum to measure thinning. The mountain is also read as a smaller rehearsal for Katla, buried under Mýrdalsjökull to the east, whose eruptions have historically followed those of its neighbour. The snowmobiling tour on Eyjafjallajökull Glacier tour route climbs the western flank from farmland near 300 metres to a plateau above 1,000, and on clear mornings the sightline runs south to the Westman Islands and north over the braided Markarfljót toward Þórsmörk. Access has always been the constraint. No road reaches the summit plateau; the final stretch is snow, and the machines that cross it descend from the tracked vehicles Iceland's rescue teams have used on ice since the 1960s. Snowmobiling tour on Eyjafjallajökull Glacier tickets carry no gate fee — entry to the mountain itself remains 0 ISK, because this is common grazing land rather than a ticketed monument. Icelanders still call the outing vélsleðaferð á Eyjafjallajökli, the plainest phrase for a plain fact: a machine, a sled, a glacier. Among South Iceland glacier landmarks, few sit this close to the Ring Road and this far above it.