The plains appear to be basaltic. Large belts of compressional ridges transect the lowlands. Beta Regio is an example of a Upland.
Uplands are centers of intense volcanism.
Ishtar Terra is the largest. Radar imaging reveals a number of interesting features seen only on Venus. Coronae consist of concentric ridges. The image of Onatah and Bahet coronae is from JPL, and is accompanied by this linked caption . Impact craters are rare, but they are found.