Kringilsárrani

Kringilsárrani is one of Iceland's most remote and least-visited nature reserves, covering approximately 6,372 hectares of highland terrain bounded by the Brúarjökull glacier outlet of Vatnajökull in eastern Iceland. ^[1] The reserve protects critical summer habitat for reindeer and serves as one of Iceland's most important breeding grounds for pink-footed geese, which have expanded dramatically here in recent decades. ^[2] The landscape consists of barren highlands, glacial outwash plains, and sparse but distinctive vegetation on volcanic substrates, representing the extreme conditions under which both plant and animal life persists in the Icelandic interior. First protected in 1975 and with protection revised in 2003 — partly due to the construction of the Hálslón reservoir created by the Kárahnjúkar hydroelectric dams — the reserve's area was reduced by approximately one quarter when part of its territory was inundated. The area's inaccessibility ensures minimal human disturbance through most of the year.

The reserve's primary wildlife significance lies in its role as summer grazing territory for Iceland's eastern reindeer herds, descended from Norwegian animals introduced between 1771 and 1787. ^[1] The Snæfellsherd has historically ranged through Kringilsárrani, though numbers fluctuate considerably year to year. Kringilsárrani is also one of Iceland's most important pink-footed goose breeding grounds; nests counted in the area west of Hálslón increased from approximately 400 in 2000 to over 2,000 in 2017, with nest density rising from around 20 to 70 nests per km². ^[2] Arctic foxes are present year-round, and golden plovers, purple sandpipers, and snow buntings nest on the open ground during the short summer season.

Vegetation is extremely sparse across much of the reserve, with the harsh climate, poor soils, and short growing season limiting plant cover to scattered patches on sheltered and stable terrain. Moss-heath communities of Racomitrium lanuginosum provide the most extensive cover on protected slopes, while grasses and sedges colonise riverbanks where moisture and nutrients accumulate. Dwarf willows barely exceeding ground level grow in the most favourable microsites, while lichens encrust stable rock surfaces. The reserve is noted for its unique plant population, including peculiar clusters of gilled mushrooms unusual for this elevation and latitude. ^[1] The vegetation's sparse character makes the carrying capacity for wildlife highly dependent on summer growing conditions.

The reserve lies on the margin of the Vatnajökull volcanic zone, with terrain consisting of glacial outwash deposits (sandur), moraines, and volcanic substrates ranging from recent tephra layers to older interglacial lavas. The landscape has been repeatedly buried and re-exposed by advances and retreats of the Brúarjökull glacier outlet of Vatnajökull, with current terrain reflecting the most recent deglaciation. Jökulhlaup (glacial outburst flood) deposits from catastrophic emptying of subglacial lakes form parts of the outwash plains, creating dynamic and unstable ground cover. The area's position atop one of Iceland's most active volcanic zones means tephra from eruptions periodically blankets the terrain, including from the nearby Bárðarbunga and Grímsvötn volcanic systems beneath Vatnajökull. Visible glacial relics and cast formations are distributed across the landscape, evidence of its glacially sculpted history.

The highland interior location at approximately 600–900 metres elevation produces one of Iceland's most severe climates, with long winters, brief cool summers, and minimal shelter from harsh winds. Average temperatures remain below freezing from October through May, with July averages reaching only 5–7 degrees Celsius. Annual precipitation is moderate at 400–600 millimetres but falls predominantly as snow that persists for 8–9 months. High winds and blowing sand or snow create difficult conditions, with visibility frequently reduced during storms that can occur even in summer. Rapid weather changes are characteristic of the Icelandic highland interior, making preparedness essential for any visit.

The barren highland interior was never permanently settled, though historical references describe use as a travel route between northern and eastern Iceland via mountain passes. The primary human connection to this area developed through the reindeer, which were introduced to Iceland from Norway between 1771 and 1787 under Danish colonial policy aimed at diversifying food sources during a difficult period of famine and cold climate. ^[1] Only those reindeer released in East Iceland survived and established permanent populations, and the animals spread independently to colonise the eastern highlands, including the Kringilsárrani area. Annual reindeer culls have been conducted since the 19th century to manage population levels. The most significant modern human impact was the 2003 reduction of the reserve caused by the Kárahnjúkar hydroelectric development.

Nature reserve designation was established in 1975 to protect the reindeer grazing grounds and the unique vegetation communities of this highland area. ^[1] Protection was significantly revised in 2003 when construction of the Kárahnjúkar hydroelectric project and the resulting 57 km² Hálslón reservoir inundated part of the reserve, including Töfrafoss waterfall, reducing the protected area by approximately one quarter. Despite the reduction, the core habitats supporting reindeer and pink-footed goose populations remain protected. Management is handled by Vatnajökull National Park staff, who carry out surveillance and operations across the remote terrain. The area's extreme remoteness provides inherent protection from most casual threats, though climate change impacts on vegetation productivity represent a long-term concern.

The reserve's extreme remoteness and difficulty of access mean very few visitors reach it, with those who do typically being experienced wilderness travellers or researchers. The opportunity to observe reindeer and pink-footed geese in their highland habitat, surrounded by vast empty landscapes stretching to distant glaciers, represents a unique Icelandic experience. The landscape itself — barren, wind-scoured, and immense — provides a sense of wilderness solitude available in few places in Europe. No marked trails exist; travel requires full self-sufficiency and navigation skills.

Access requires four-wheel-drive vehicles capable of river crossings on difficult highland F-roads, with the approach typically via Route F910 or F923 from the north or east. No facilities of any kind exist within the reserve, and the nearest services are many hours of rough driving away. The accessible period is limited to approximately mid-July through August, when snow has melted sufficiently and rivers are passable. Visitors must be entirely self-sufficient with fuel, food, and emergency equipment, with communication only via satellite devices in this mobile-phone-free zone.

Protecting the reindeer grazing habitat and pink-footed goose breeding grounds from disturbance is the primary conservation objective, with access restrictions during sensitive periods. ^[1] The 2003 reduction of the reserve due to the Hálslón reservoir was a significant conservation setback, though populations of key species have continued in the remaining protected area. Climate change threatens the reserve through potential reduction in summer vegetation productivity, altered snow cover patterns affecting reindeer winter survival, and changes to the glacial water systems. Volcanic eruptions from the nearby Bárðarbunga and Grímsvötn systems could devastate vegetation through tephra deposition, as occurred historically. The reindeer population management programme balances culling with habitat capacity to prevent overgrazing of the limited vegetation.