The Fjallsárlón Glacier Lagoon is located in the southern part of the Vatnajökull Glacier. Icebergs drift in the water and, and when colliding with each other, make sounds similar to groans. The lagoon's surface area is 4 sq km (1.5 sq mi). Fjallsárlón is located only 10 km (6.2 mi) from Jökulsárlón. It is not as famous and picturesque as the latter, hence – fewer tourists. The glacier calving into the lagoon is a part of Vatnajökull National Park.
Above the lagoon, there is the famous volcano Öræfajökull. In summer, the average air temperature is 10-13 °C (50-55 F), and in winter it drops to 0 °C (32 F). If the temperature drops below, the lagoon gets completely covered with ice.
There is a cafe near the lagoon where you can rest and eat.