I'm gonna talk about a really, really cool lake, but first, some geology lessons.
On Earth, mountains and valleys tend to be formed by tectonic motions or volcanism, and then shaped by erosion (mostly water and wind erosion) back into their lowest possible forms. This is why the Appalachians are so much more rounded than other, spikier and younger mountain chains...
On Mars, there is some evidence of that process having taken place as well, but mostly only in the distant past. On Mars, there is a very weak atmosphere which can't really do much to erode away mountains or craters, and so they stay, but the tallest mountains, they tend to flatten out just to the force of gravity.
Take the Alba Mons and Olympus Mons for instance, Alba Mons is a much older volcano, and it has been stretched out by gravity, trying to deform the planet back into a sphere, but Olympus Mons is younger, and that process has only just begun for it.
The stresses of weight of Alba Mons on the surrounding lands has caused a series of striking tectonic features, huge rifts where tectonic pressure has deformed the land. Olympus Mons hasn't yet deformed to the same extent that Alba Mons has, but all of the mass of the Tharsis igneous provinces are being deformed in this way.
The Himalayas and highlands of Asia, likewise, is a very high up region with a lot of mass causing some strain gravitationally, but more than that, on Earth, there's tectonic plates. Huge slabs of crust that tend to move together, one of these places is where Asia is tearing itself apart, this is a place that's home to the world's deepest freshwater lake, a lake so big that it's about the same size as all the Great Lakes combined...
@starwall does this absence of tectonic activity plus gravity almost on par with earth lend evidence to why there aren't many mountain ranges of note (that we know of) on Venus
@patience Venus does have tectonics, just not global tectonic plates like Earth does. Both Mars and Venus have some local tectonic stuff going on. Theories abound as to why Earth has tectonic activity such like it does, mostly it's chalked up to convection of the mantle.
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