Impact Structures are those created by asteroids striking the earth. Indian geologists have recently discovered one of the largest impact structure in the world created about 2500 million years ago by an asteroid is about one km in diameter in Shivpuri district of Madhya Pradesh. It is called Dhala structure after the village near which it was discovered. It is the eroded remnant of a structure with an estimated present day diameter of 11 km. So far, this is the largest impact structure in Asia and there is no confirmed impact structure found in Japan and China. The first impact structure in India, a smaller one, was discovered in Lonar. This discovery by Jayanta K. Pati is reported in August 2008 issue of the Meteoritics and Planetry Science, Journal of the Meteoritical Society published from the University of Arizona in the U.S. The Lonar impact structure was discovered by a British scientist and confirmed by the Americans. The Dhala structure was accidentally discovered in 2005 by Pati, former head of the Department of Earth and Planetary Sciences of Allahabad University of India while studying some rocks from Bundelkhand crater. He noticed some signatures of shock metamorphisiim suggesting the presence of an impact structure. The evidences were sent to University of Witwaterstrand of South Africa in 2005. 113 thin sections of various rock types from 12 different places were subjected to optical microscopy and the presence of diagnostic shock metamorphic features such as planar deformation features in quartz was noted. Dhala’s is now confirmed as an impact structure. It is significant as it widents the field of occurrence of impact structures on earth into Asia. Besides Dhala, a four-km wide crater called Ramgarh structure in Rajasthan and Shiva structure in the Arabian Sea have been suggested as possibly of impact origin.