Bigach Crater, Impact crater in eastern Kazakhstan.

Bigach Crater is an impact structure in eastern Kazakhstan with a diameter of roughly 8 kilometers. The circular rim has been reshaped by tectonic movement and natural weathering over millions of years.

The crater formed around 5 million years ago when a meteorite struck Earth's surface during the Pliocene epoch. Geological processes have continuously reshaped its structure since that initial impact event.

The crater's name comes from the Kazakh word qiğaş, meaning "curved", a reference to the shape of the 8 km-wide depression in the steppe. The site lies in eastern Kazakhstan, near coordinates 48.57°N, 82.02°E, and the crater floor is exposed at the surface.

The exposed rock surface and crater formations are accessible for geological study and observation. Visitors interested in impact structures should be prepared for a remote location with basic amenities and rugged terrain.

The name Bigach comes from the Kazakh word qiğaş, meaning "curved", a reference to the crater's outline. The site lies at about 48.57°N, 82.02°E in eastern Kazakhstan, and its age is given as 5 ± 3 million years, so the impact falls somewhere in the Miocene or Pliocene.