A magnetic anomaly detector is an instrument used to detect minute variations in the Earth's magnetic field.

recognized as the largest magnetic anomaly on Earth.

a local variation in the Earth's magnetic field centered at Bangui, the capital of the Central African Republic.

The Temagami Magnetic Anomaly, also called the Temagami Anomaly or the Wanapitei Anomaly, is a magnetic anomaly resulting from a large buried geologic structure in the Canadian Shield near Temagami, Ontario, Canada.