Artemis Chasma is the nearly circular fracture in Venus' surface which almost encloses Artemis Corona. The chasma and its associating corona can be found on the Aphrodite Terra continent, at Latitude 35° South, Longitude 135° East. (wikipedia entry)
A chasma is a deep, elongated, steep-sided depression. On Venus they are named after goddesses of hunt; moon goddesses.
Image Source. Marker locations are approximate and may not always appear to align with image on map.