I love the detail on this! The numbered towers are the legacy dungeons, The pipes are ways in/out of the underground areas like siofra river, the switch palaces are the divine towers and the stars are the four-bellfries, the crucible that teleports you to ashen lyendel, and the town in the snowfield that teleports you to the haligtree. Not sure what the one at ranni’s place is though.

To be fair it has been a while since I played but I’m sure the red/yellow dots and the haunted mansions signify something too.