Kerid Crater Lake: Iceland's Vivid Aquamarine Volcanic Gem

There are craters that yawn open to the sky, and there are craters that hold a secret pool of aquamarine—Kerid, in Iceland's Golden Circle, is the latter. This perfectly circular caldera, cradled by steep walls of red volcanic scoria, is a geological amphitheatre where the earth's violent past has been softened into a serene, almost meditative bowl of vivid water. At 55 metres deep and roughly 170 metres wide, Kerid is not the largest of Iceland's volcanic features, but it is certainly one of the most accessible and visually arresting. To stand on its rim is to witness a singular convergence of fire and ice, where the raw, oxidized colours of the rock meet the cool, jewel‑toned clarity of the lake below, creating a scene that feels both ancient and freshly painted.

The Collapse That Created a Perfect Bowl

Kerid's origin story is one of subterranean drama. Roughly 6,500 years ago, a volcanic eruption occurred in the region, ejecting lava and ash. However, unlike the massive tephra‑ring craters that dot the Icelandic Highlands, Kerid is classified as a collapsed crater, or a "maar" variant. After the eruption, the magma chamber beneath the surface rapidly drained, leaving a hollow void. Without the support of the magma, the overlying roof of solid rock and soil collapsed inward, creating the distinct, bowl‑shaped depression we see today. The surrounding walls are composed of loose red scoria and volcanic rock, which oxidised over time to create that characteristic rusty hue. The lake itself is fed not by glacial rivers but by groundwater and rainfall, which have slowly filled the basin to a depth of approximately 35 metres. The water level fluctuates with the seasons—rising in the spring melt and receding in the drier months—but its clarity and colour remain remarkably consistent. This geological footprint, so accessible and clearly defined, makes Kerid a textbook example of a volcanic caldera, offering a tangible connection to the powerful forces that continue to shape the island.

Craftsmanship & Experience: The Walk of the Rim

Experiencing Kerid is an exercise in simple, unadulterated observation. A well‑maintained path traces the circumference of the crater rim, offering a 360‑degree panorama that shifts with every few steps. From the highest point, the water appears as a polished gem, its surface barely disturbed by the wind. As you descend along the designated trail to the water's edge, the perspective shifts dramatically—the towering walls enclose you, and the water’s colour deepens from a pale turquoise to a rich, opaque aquamarine. The craftsmanship here is not in the infrastructure but in the natural curation of the space: the way the light reflects off the water, the contrast of the red rock against the blue, the moss and grass that cling to the rim. It is a place that demands time—a slow circuit, a pause to sit on the volcanic stones, a moment to listen to the silence that fills the bowl. For the more adventurous, there is a small wooden platform that allows you to lean out over the water, though the steep drop below is a reminder of the crater's depth. The experience is intimate, almost theatrical, as if the earth itself has designed a stage for a play about stillness.

"In the red bowl of Kerid, the water is not merely a reflection of the sky—it is a distillation of the earth’s quiet after a long, loud eruption."

— TIMELESS GENIE FEEDS DESK

Curation & Strategic Insight: The Art of the Circular Perspective

For the discerning traveller, Kerid is more than a quick stop on the Golden Circle tour; it is a destination that rewards careful curation. The strategic approach is to visit during the shoulder hours—early morning or late afternoon—when the tour buses have departed and the light casts long, dramatic shadows across the crater walls. The aquamarine colour is most intense when the sun is high, but the golden hour creates a softer, more contemplative atmosphere, where the red rocks seem to glow and the water takes on a deeper, more mysterious hue. Kerid is also a photographer’s dream, and a polarizing filter will dramatically enhance the water’s colour. For a truly curated experience, consider combining the visit with a stay at a nearby farmstay, where you can experience the Icelandic countryside and enjoy a traditional lamb dinner before arriving at the crater for sunset. This bespoke approach transforms a fleeting visit into a narrative moment, allowing you to connect with the landscape on a more personal level.

Practical Guidance for the Crater Explorer

Kerid is located just off Route 35, approximately 15 kilometres north of Selfoss, making it a convenient stop on the Golden Circle route. There is a small parking area with a modest entrance fee, which contributes to the maintenance of the trail and the preservation of the site. The rim trail is an easy walk, suitable for most visitors, and the descent to the water is via a steep but manageable staircase. Sturdy shoes are recommended, as the loose scoria can be slippery, especially after rain. The Icelandic weather is famously changeable, so pack a windproof jacket and layers—the open crater rim is exposed to the elements. While swimming is not permitted, the lake offers a visual feast that needs no immersion. The best time for photography is between 11 a.m. and 2 p.m. for the most vibrant water colour, or at sunset for dramatic lighting. There are no facilities at the crater itself, so bring water and snacks. Allow at least 45 minutes to an hour for a full circuit and a descent. Respect the environment: stay on the marked paths, do not disturb the rock formations, and carry all waste out with you.

What is the geological origin of Kerid Crater Lake?

Kerid is a collapsed volcanic crater, not a classic explosion crater. Approximately 6,500 years ago, the magma chamber beneath the surface drained after an eruption, causing the overlying rock to collapse into the empty void, forming a circular caldera. Over time, groundwater and rainwater filled the basin, creating the lake we see today.

Why is the water in Kerid so vividly aquamarine?

The lake's striking aquamarine colour is primarily due to the reflection of the sky and the surrounding environment on the mineral‑rich water. The water is deep, reaching up to 35 metres, and contains dissolved minerals that absorb certain wavelengths of light, enhancing the blue‑green spectrum when sunlight hits the surface.

Can visitors walk around the crater rim and down to the lake?

Yes, a well‑maintained trail encircles the entire rim, offering panoramic views of the caldera. There is also a designated path that descends steeply to the water's edge, allowing visitors to experience the lake from the shore. The walk is relatively short and accessible to most fitness levels.

When is the best time to visit Kerid Crater Lake?

Summer (June to August) offers mild temperatures and vibrant green vegetation on the rim, with the water at its most luminous. Winter (November to March) transforms the lake into a frozen, snow‑dusted bowl of white and deep blue, creating a starkly different but equally arresting scene.

What makes Kerid unique among Icelandic volcanic craters?

Unlike the massive, explosive craters of the Highlands, Kerid is relatively small and intimate, with a depth of about 55 metres from rim to water. Its distinctive red scoria and volcanic rock walls, combined with the vibrant aquamarine water, create a stark and photogenic colour contrast that is rare among Iceland's geological wonders.

Kerid is a reminder that the earth’s most captivating forms are often the result of a quiet aftermath. The violence of the eruption is long gone, leaving behind a perfect, silent bowl—a place where the elements have reached a delicate equilibrium. To visit is to witness that balance, to stand between the red of the rock and the blue of the water, and to feel the profound stillness that follows a great release of energy. In that stillness, there is a lesson: that destruction can be beautiful, that chaos can give way to order, and that the most memorable landscapes are those that hold the memory of their own making.