This is an image of a Venusian volcanic dome.
Click on image for full size
These domes may look a little bit like craters, but they are really flat-topped
Mt Pelee in Martinique, West Indies, and Lassen Peak and Mono domes in California are examples of similar lava domes on Earth.
These domes are formed the same way some islands are built on Earth, by a hot plume, or bubble of material from the deep interior of Venus, which rises to the surface. These plumes push out the crust and cause volcanic activity.
Among the different kinds of domes on Venus are:
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