The first glacial lagoon we have visited was Fjallsárlón. It is a small lagoon located on the southern end of the Vatnajökull glacier. The outlet glacier Fjallsjökull, originating from Vatnajökull, extends all the way to the lagoon’s surface, where large icebergs break away from the ice cap and fall into the water below. With the many hundreds of icebergs that float atop the lagoon’s surface, Fjallsárlón is considered to be a strong second to the nearby, and more famous, Jökulsárlón glacial lagoon. With a maximum depth of 248 meters, Jökulsárlón is Iceland’s deepest lake. It covers 18 square kilometers. The icebergs in Jökulsárlón are composed of ice that is over 1000 years old. Like Jökulsárlón, Fjallsárlón is characterized by its unique and glittering icebergs. No iceberg is alike, with many hundreds of different shapes and sizes, as these icebergs drift from place to place, they will often collide and exulting a loud groan.