Kerid, also known as Kerið, is a volcanic crater located in South Iceland, about 3 kilometers (1.9 miles) north of the town of Selfoss. The crater is approximately 270 meters (886 feet) wide, 55 meters (180 feet) deep, and 55 meters (180 feet) high. It is believed to have been formed about 3000 years ago, during a volcanic eruption that left a collapsed magma chamber.

Kerid is a popular tourist destination and is part of the Golden Circle, a popular route that includes other popular sites such as the Geysir geothermal area and Gullfoss waterfall. Visitors can walk along the crater's rim to enjoy panoramic views of the surrounding countryside, or descend into the crater to explore its turquoise lake, which is approximately 14 meters (46 feet) deep.

The lake within Kerid is an unusual sight, as it is filled with mineral-rich water that appears bright blue-green against the red and black rock walls of the crater. The water level in the lake can vary depending on the season and precipitation, and it is not always possible to access the lake's shore.

Kerid is one of several volcanic craters in the area, and the landscape around the crater is dotted with small hills and lava fields. It is believed that the area was formed by a series of volcanic eruptions that occurred thousands of years ago. Today, the area is known for its rugged natural beauty and is popular with hikers, photographers, and nature lovers.