This is a map of Venus.
Click on image for full size
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
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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