Geology of Mars of the dichotomy places a significant constraint on theories of its origin. Straddling the dichotomy boundary in Mars's western hemisphere is a massive volcano-tectonic province known as the Tharsis region or the Tharsis bulge. This immense, elevated structure is thousands of kilometers in diameter and covers up to 25% of the planet’s surface. Averaging 7–10 km above datum (Martian "sea" level), Tharsis contains the highest elevations on the planet and the largest known volcanoes in the Solar System. Three enormous volcanoes, Ascraeus Mons, Pavonis Mons, and Arsia Mons (collectively known as the Tharsis Montes), sit aligned NE-SW along the crest
Mount Olympus (Tasmania) the first work acquired by the gallery of an Australian-born artist. Another of Piguenit's Olympus paintings is held by the National Library of Australia. Nothofagus gunnii was first collected by Ronald Campbell Gunn in 1847 from Olympus. It is "Australia's only cold climate winter-deciduous tree", is found mainly in areas above 800 metres with rainfall of more than 1800mm, and is one of the plants that indicates Gondwana. Mount Olympus (Tasmania) Mount Olympus is a mountain in the Cradle Mountain-Lake St Clair National Park in Tasmania, Australia. It is the 24th highest mountain in Tasmania at above sea level and