Magnetic anomalies

area in South Atlantic where the Earth's magnetic field is weakest relative to an idealized dipole, so that the inner Van Allen radiation belt comes closest to the Earth's surface (altitude 200 km), exposing satellites to higher-than-usual radiation

anomaly of the Earth's or other astronomical object's magnetic field

mountain in Mauritania

Říp (; ) is a high solitary hill in the Lower Ohře Table in the Czech Republic. It is located southeast of Litoměřice. According to national legend, it is the place where the first Czechs settled. The mountain and the rotunda on its top are protected as a national cultural monument.

island in Croatia

Keurusselkä is a lake in Central Finland between the towns of Keuruu to the north and Mänttä to the south. It covers an area of . Its average depth is with a maximum depth of . The surface lies at above sea level. The lake is long and is a part of the Kokemäenjoki River basin. Keurusselkä gained international publicity in 2004 when a pair of amateur geologists discovered an ancient impact structure on the western shore of the lake.

Karikkoselkä is a lake formed in an impact crater in Petäjävesi, Finland. Karikkoselkä is located in Central Finland approximately 30 km east from the centre of Keurusselkä, a much older and larger impact crater. Most lakes in the region are elongated in northwest–southeast direction due to glaciation, but Karikkoselkä is strikingly round.

extinct volcano in the Netherlands

volcanic complex on the lunar far side

submarine volcano off the eastern coast of Japan, at the southern tip of the Izu Islands.

dead volcano on the Dutch part of the North Sea