Volcanic rises are thought to be formed by plumes, in a similar fashion to island formation on Earth. On Venus, there are three types of volcanic rises:
- These are rises that contain two or more deep rift valleys. These valleys cut through most of the rise itself, but also extend several hundred kilometers beyond the rise itself. Atla Regio and Beta Regio are rift-dominated rises.
- Volcano-Dominated Rises
- These rises lack deep rift valleys. They do contain one or more large shield volcanoes. Western Eistla Regio and Imdr Regio are volcano-dominated rises.
- Corona-Dominated Rises
- These rises lack large rift valleys, like volcano-dominated rises. But instead of being dominated by shield volcanoes, their surfaces are dominated by coronae. Corona-dominated rises include Eastern Eistla Regio and Themis Regio.