For those in awe of the cartographic skills of George R.R. Martin or J.R.R. Tolkien, wondering how they could have possibly developed such detailed maps of completely fictional worlds, maybe Martin O'Leary's 'Generating Fantasy Maps' project is the answer. Though it's unlikely that the creative geniuses above used O'Leary's fantasy map generator (especially considering that both their series were developed before the project even existed,) Generating Fantasy Maps gives anyone the ability to create richly detailed continents in seconds.
The project uses advanced code to create its landscapes. Beyond simply developing random topographies, the 'Generating Fantasy Maps' project also includes the most likely locations of major cities and even gives those fictional cities names. By combining code for labeling with code for cartography generation, O'Leary's project is an easy way for amateur fantasy writers to kick-start their next novel.
Fantasy Map Generators
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Interactive Fantasy Maps
Historical Street View Projects
Granular Fantasy Cartography
Optimized Road Trip Maps
3D Galactic Maps