Artemis, a unique 2600-km-diameter circular feature on Venus, defies geomorphic classification as a corona, crustal plateau, or volcanic rise. Artemis is similar in size to plateaus and rises, yet topographically resembles a corona. Geologic mapping using correlated digital remote data sets including NASA Magellan C1-, C2-, and Fscale synthetic aperture radar (SAR) imagery, altimetry, and synth...