It's possible to do, even for mere humans like myself. It depends greatly on the purity of the air and the flatness of the land. As such, it would be impossible in a city, between the smog and the buildings, but is more than possible in a desert. For instance, on one ledge of the Grand Canyon, it's possible to see a mountain that's a hundred miles away. Not just possible, you can't miss it.
And if it's a sunny day, the glare off the water would be fairly telling, even if you couldn't entirely tell what something was otherwise. Welcome!
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