How did the geography of the world change during the period of Alexander’s rule?

Alexander III of Macedon (Alexander the Great), apart from being a great military tactician and in a way promoted some initial version of globalization, he was also an explorer.  With his conquering, Alexander and the Macedonian soldiers managed to reach parts of the world that were either unknown, or were things of legends and myths in Europe.  Multiple people that were historians, philosophers, or were interested in any science were writing down pretty much everything, and they also were trying to make maps of the newly discovered places, which gave the people in Macedon, and all the others from the region that the world is much bigger than they thought previously.