I was going to create a black and white map, with arcologies, of an early Mercurian-world, but I colorized it and it hence has no human-settlements on it:
I found an map of Mercury, two-colored it, then, I expanded it and then added water and colorized it: I wanted it to be like early-Earth, but I have to remake the equator if I want to match Earth's early rotation (days that were six-hours long).
If K-Type Star: 0.3 AUs
If G-Type Star: 0.75 AUs
Gravity: 0.5 gees.
Rotation: 32-hours.
Axial-Tilt: Zero-degrees.
Temperature: 100+ degrees Celsius.
Air-Pressure: twenty times that of Earth's; on the surface, every where you look, it looks like you're in a fish-bowl.
Water is still liquid, despite being beyond the boiling point: it's green because it's full of iron.
Atmosphere: 1% oxygen, thanks to solar-wind breaking down CO2. Still not enough to breathe on your own.
Geology: Mostly volcanoes: the planet has no mantle; just a thin-crust of seven-miles at the most on top of a molten, metallic-core. The world is mineral and metal-rich.
Life: primitive single-cell extremophiles, living in the ocean near volcanic-vents. Life is a combination of carbon/silicon-based with DNA in spherical-clusters, not strands.
The original-Map is huge!
https://iili.io/JGh5TGI.gif