Mt. Keilir (379 m) and the grassy plain Höskuldarvellir in SW-Iceland, seen from the slopes of Mt. Trölladyngja. This sizable patch of natural grassland is rare in the Reykjanesskagi peninsula, which is mostly covered with recent moss-covered lava flows and small hyoloclastite mounts and ridges like Keilir, formed by subglacial eruptions in the last ice age.