Introduction to the volcanic group: The Yitong volcanic group is located in the main branch fault zone of the northern extension of the Tanlu fault zone, a giant structure in eastern my country, that is, in the Yishu graben basin. The volcanic cones are shaped like stalactite peaks and are distributed in two rows on the plains of the Itong Basin along the northeast direction. The 16 volcanic cones in the reserve are all isolated and scattered. The core area is 405.8 hectares, accounting for 53.1% of the total protected area. The main landform types include fault block mountains, fault depression plains, graben basins and barrier mountains. wait.