One of several crater lakes in the western volcanic zone of Iceland, covering the Reykjanes Peninsula and the Langjökull glacier. These lakes appeared in volcanic craters formed when the crust moved over a hot spot. The Kerid Lake crater is particularly well preserved because it is half the age of most neighboring volcanic structures: it is about 3 thousand years old. This also applies to the nearby group of Seydishowlar craters, as well as to the Kerhoudl crater. The crater in which this lake lies is 55 meters deep and 270 x 170 meters wide. Its walls are made of red volcanic stone. The slope of the crater is for the most part quite steep and sparse in vegetation, but on one side it is gentler and covered with moss, which makes it easy to go down. The lake itself is shallow, its depth is 7-14 m

Þingvellir (Icelandic: [ˈθiŋkˌvɛtlɪr̥] ⓘ, anglicised as Thingvellir[Note 1]) was the site of the Alþing, the annual parliament of Iceland from the year 930 until the last session held at Þingvellir in 1798.[2] Since 1881, the parliament has been located within Alþingishúsið in Reykjavík.[3] Þingvellir is now a national park in the municipality of Bláskógabyggð in southwestern Iceland, about 40 km (25 miles) northeast of Iceland's capital, Reykjavík. Þingvellir is a site of historical, cultural, and geological significance, and is one of the most popular tourist destinations in Iceland. The park lies in a rift valley that marks the crest of the Mid-Atlantic Ridge and the boundary between the North American and Eurasian tectonic plates. To its south lies Þingvallavatn, the largest natural lake in Iceland.[4]

The Hvítá river flows southward, and about a kilometre above the falls it turns sharply to the west and flows down into a wide curved three-step "staircase" and then abruptly plunges in two stages (11 metres or 36 feet, and 21 metres or 69 feet)[1] into a crevice 32 metres (105 ft) deep. The crevice, about 20 metres (66 ft) wide and 2.5 kilometres (1.6 mi) in length, extends perpendicular to the flow of the river. The average amount of water running down the waterfall is 141 cubic metres (5,000 cu ft) per second in the summer and 80 cubic metres (2,800 cu ft) per second in the winter. The highest flood measured was 2,000 cubic metres (71,000 cu ft) per second.

Geysir lies in the Haukadalur valley on the slopes of Laugarfjall lava dome, which is also the home to Strokkur geyser about 50 metres (160 ft) to the south. The Strokkur geyser may be confused with it, and the geothermal field it is in is known usually as either, Geysir or Haukadalur. Eruptions at Geysir can typically hurl boiling water up to 60 m (200 ft) in the air. However, eruptions are nowadays infrequent, and have in the past stopped altogether for many years at a time.