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Trying to create a map for my fictional world. Obviously, I can do bits like color a paper blue and throw some random green shapes on there to create the land masses. However, the more I look into this the more I realize it's very very difficult. Rivers flow a certain way, vegetation grows in some places but not others. This is hard to fake.
Ideally, I would like to find some kind of program (free) where I could just click "generate" and get a map world with oceans, rivers, lakes, vegetation, etc.
If this isn't an option, are there tips and tricks I can follow to create a natural, authentic feel?
Any ideas for this?