Ljótipollur, also known as the 'Ugly Puddle' (despite being stunning), is an explosion crater and crater lake in Iceland's southern Highlands. It's part of the Veiðavötn volcanic area and offers a beautiful sight with its blue waters, green vegetation, and red lava rock surroundings. Accessible via a hike from Landmannalaugar, it's a perfect spot for a quick adventure in the highlands.