This is a map of Venus.
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NASA

Venus Tessera

Tessera is a unique feature of Venus, and is also known as "complex ridged terrain". These features are found on some of the Venus Plateau Highlands.

Tessera is created is by a shortening of the lithosphere. That is, when the crust is pushed together, the surface folds, buckles, and breaks, and the crust itself becomes thicker. This process may be related to the process of mountain-building on Earth. But, because Venus lacks plate tectonics the process must occur somewhat differently. Most plateau highlands are thought to be regions where the crust is relatively thick. Because crustal material is less dense ("lighter") than the mantle rocks below, regions of thick crust rise higher than surrounding areas where the crust is thinner. This is illustrated in the above sketch.


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