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Rainbows are one thing that Iceland has no shortage of. This particular one was captured while driving along the south coast, and is a fine example of storm lighting. The sun is peeking through the clouds to the left of the frame and has illuminated the cliffs beautifully, contrasting with the dark stormclouds in the frame. The rainbow is a stub formed by the highly filtered light - the cliff and clouds prevented it from growing any further.
Lómagnúpur is the most impressive of the cliffed mountains on the south coast, but it sometimes feels like the entire coastline is covered with cliffs of this stature. They once marked the coastline, and were sea cliffs. Over the millenia, glacial melt and outwash floods have deposited silt which has extended the coast by a few miles of flat and fertile land.