Granby is an

impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...

in Östergötland, Sweden, located to the southeast of

Vadstena Vadstena () is a locality and the seat of Vadstena Municipality, Östergötland County, Sweden, with 5,613 inhabitants in 2010. From 1974 to 1979 Vadstena was administered as part of Motala Municipality. Despite its small population, Vadstena ...

. It is estimated to have formed about 470 million years ago (Middle

Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...

). The crater is in diameter and is not exposed at the surface.

References

Impact craters of Sweden Ordovician impact craters Ordovician Sweden Landforms of Östergötland County {{Östergötland-geo-stub