On the geologic map shown here (actually more a tectonic map), yellow areas are 1 km and more above the mean elevation of Venus. These areas are generally large volcanic centers. There are two large "continents" on Venus that contain large areas of tectonically uplifted and deformed crust. Blue areas are below the mean radius of Venus and comprise most of the Planitia areas on Venus. These areas are mostly lava plains with no to moderate amounts of deformation.
Structual features are shown as follows:
Normal faults are dark green with hachures on the downdropped side.
Dorsa (compressional ridges) are black lines with solid black diamonds.
Named volcanic features (Tholus, Patera, Farrum, most Montes) are red triangles. This is by no means a complete inventory.
Named tesserae are dark blue stars.
Named coronae are circles with hachures pointing outward. They are approximated as circles although many are elliptical or somewhat irregular. Some geologists interpret coronae as analogous to terrestrial hot spots.
Named craters are plain circles. Most are too small to show prominently at this scale.
These maps are azimuthal equal area, which provide a somewhat realistic foreshortening toward the edge of the hemisphere, but not the extreme foreshortening of a true orthogonal projection.