Hraunfossar, meaning "lava waterfalls," is a series of waterfalls located in western Iceland. It is situated in the Hvítárvatn river, which emerges from beneath the Hallmundarhraun lava field, a vast expanse of hardened lava created in an eruption in the 10th century. The waterfalls are located approximately 90 kilometers northeast of Reykjavik, near the town of Borgarnes.

The water flows from beneath the lava field and cascades into the river Hvítá in a series of small waterfalls, creating a stunning visual effect. The water appears to come from nowhere, emerging from beneath the ground and then flowing over a distance of approximately 900 meters (2,950 feet) in a series of cascading waterfalls that vary in height, width, and color.

One of the unique aspects of Hraunfossar is its colors. The waterfalls are surrounded by vibrant green moss, which contrasts beautifully with the clear blue and white water of the river. The waterfalls are also surrounded by basalt columns, which were formed by volcanic activity millions of years ago.

Visitors can view the waterfalls from a wooden walkway that winds its way alongside the river. The walkway offers several viewing platforms, allowing visitors to get up close to the waterfalls and to take stunning photos.