The colors of a map tile may give information about that region's predominant biome: its temperature, alignment, and other handy things. Cyan or blue means the area is "good" aligned. Purple and grey/red areas have "evil" alignment. Light grey, brown, and yellow areas usually are dry and have sparse vegetation. Green tiles have vegetation and are usually moist. White tiles indicate snow.
Tiles are listed in by alignment, with regular tiles first, then good aligned tiles, and then evil tiles.
|Human cities and towns
|+ * # ☼
|Dwarven mountainhomes and fortresses
Lighter colored fortresses and towns are more populous.
|Ω Ω Ω
Pink ones are more heavily populated than the gray ones.