Fjallsárlón receives fewer than a tenth of the visitors that crowd Jökulsárlón six kilometres east, yet its glacier — Fjallsjökull, an outlet tongue of Vatnajökull — calves icebergs into water so clear that you can see submerged ice shelves three metres below the surface.
The lagoon formed in the 1930s as the glacier retreated from its Little Ice Age maximum, and has since expanded to roughly two square kilometres, deepening each decade as meltwater carves the basin wider. Unlike its famous neighbour, Fjallsárlón sits in a narrower basin framed by steep moraine ridges, which channel wind and concentrate icebergs in dense rafts near the glacier terminus.
Boat operators launched zodiac tours here in the early 2000s, threading between bergs that range from car-sized fragments to multi-tonne slabs striped with volcanic ash layers from eruptions centuries past. The lagoon's compact geometry means every departure brings passengers within a few hundred metres of the calving face, close enough to hear the creak and snap of ice under compression. On windless mornings the water mirrors the glacier's crevassed snout, doubling the scene in perfect symmetry. Fjallsárlón tours navigate channels that shift daily as icebergs rotate, melt, and fracture, turning the lagoon into a self-renewing maze.
The glacier's recent retreat — more than a kilometre since 1990 — has exposed fresh moraine and proglacial streams, visible from the lagoon's southern shore. Guides often pause mid-tour to retrieve small ice fragments for passengers, pieces dense enough to sink and cold enough to numb fingers in seconds. The ice itself holds trapped air from medieval winters, released as faint hisses when the fragments melt. Most fjallsárlón glacier lagoon boat tour departures run between May and October, weather permitting, with operators adjusting schedules to tidal and wind conditions. The site remains open year-round, though winter access depends on road clearance along Route 1.
Fjallsárlón's relative obscurity preserves a quieter encounter with Vatnajökull's dynamics, one where the sound of oars or outboard motors competes only with the occasional crack of calving ice. The lagoon's pale blue-green hue — a result of glacial flour suspended in the meltwater — deepens toward the glacier, marking the boundary where sediment concentration peaks. Amphibian boat tours, introduced in recent years, allow direct boarding from the shore, eliminating the need for separate watercraft transfer.
10 hr
