Klettshellir

Klettshellir is not a roadside cave or a self-guided walk. It sits in the sea-cliff setting below Ystiklettur, so the experience depends on reaching Heimaey, choosing a boat trip, and accepting that wind, swell, and operator judgment shape what happens on the water.

A local Iceland travel editor would add Klettshellir for travelers who have given the Westman Islands enough time for both land and sea. They would skip it for a rushed South Coast day where Seljalandsfoss, Skogafoss, Dyrholaey, and Reynisfjara already create a full route.

The cave sits under the Ystiklettur cliffs near Klettsvik, where the harbor-side landscape changes from green-topped rock to vertical sea walls. From the water, the opening reads less like a hiking destination and more like a place carved for boats, echoes, and careful maneuvering.

That is why Klettshellir pairs better with the volcanic island story than with a normal cave checklist. Eldfell gives you the land-based eruption context, while Surtsey viewpoints and the boat route explain why the Westman Islands feel so different from mainland South Iceland.

For most travelers, the real effort is not walking; it is sequencing. You need to reach Landeyjahofn, cross to Vestmannaeyjar, join a suitable boat departure, and still leave room for whatever else made Heimaey worth the detour. If you are bringing a car, building the cave into a short itinerary, or returning to the mainland the same day, the margin matters.

A balanced version gives the boat trip its own block and keeps the rest of the island simple. A slower version adds Eldfell or harbor time before returning to the mainland. A tight version tries to combine the ferry, cave, and a full South Coast route; that is the version most likely to disappoint.

If your route is built around waterfalls and black-sand coast, keep the mainland sequence simple: Seljalandsfoss first, then Skogafoss, Dyrholaey, and Reynisfjara as the day moves east. Add the Westman Islands only if you are willing to make the ferry and boat trip the headline choice.

If your trip has more room, Klettshellir can add something the mainland stops cannot: a sea-level view into cliffs, caves, bird ledges, and volcanic coastline. The South Coast road trip guide is the better place to decide whether that detour strengthens the driving day or turns it into too much.

• Choose Klettshellir over another mainland stop when you want the Westman Islands to feel like a separate chapter.
• Choose Eldfell first when land-based volcanic context matters more than a boat trip.
• Choose Seljalandsfoss, Skogafoss, Dyrholaey, and Reynisfjara first when this is your only South Coast day.

The checks are straightforward: Herjolfur for ferry travel, the boat operator for suitability and tour details, SafeTravel for safety guidance, Umferdin for roads to the ferry, and the Icelandic Meteorological Office for weather and sea-weather context. Let those sources decide the day when wind, swell, visibility, road conditions, or ferry notices affect the plan.

Do not make the cave your only reason for crossing if the rest of the island would not interest you. If the water portion changes, a good Heimaey day should still have enough value through Eldfell, harbor views, volcanic history, and the island coastline.