The Hegau Volcanoes are a group of volcanic formations located in the Hegau region of southwestern Germany. These volcanoes were formed during the late Tertiary period, around 10 to 20 million years ago, and are characterized by their distinctive conical shapes. The area is known for its scenic landscapes, featuring numerous craters and lava flows. The Hegau region is also home to several historical sites, including castles and ruins that offer a glimpse into the area's past. The volcanoes are primarily composed of basalt and other volcanic rocks, making them an interesting subject for geological studies and attracting visitors interested in nature and history.