Colour-coded topographic map of the region surrounding Venus' north pole. Bright yellow areas are the highest & dark orange areas the lowest. The yellow region is Ishtar Terra and contains Lakshmi Planum (left) and the Maxwell Montes (right), the highest mountains on Venus. The two crater-like depressions in Lakshmi Planum are the calderas of two volcanoes, Colette (left) & Sacajawea (right). The map was compiled using data from the Soviet Venera 15 & 16 spacecraft, the American Pioneer Venus spacecraft and the Arecibo radio telescope in Puerto Rico.