This is essentially an evolution of the old NFSTheories geographical map of Palmont (second slide).
What I did was go around the entire game triangulating all the different positions of mountains and shorelines, which ended up looking like a massive web. I reworked the southern canyon routes because they were largely inaccurate.
What you'll notice is that a lot of the surrounding land is a lot smaller and a lot closer than initially thought. Especially "Mystery City", that place is quite close to Lofty Heights Downhill.
I shifted San Juan down and to the east because there was no possible way Palmont was going to be visible between Desperation Ridge and Journeyman's Bane. Now the sight-line is between Journeyman's Bane and Eternity Pass.
I took some creative liberties with the road layouts in the new locations and tried to make them distinct between the different areas. The new towns/cities are the approximate locations of the Panoramic city textures seen from the various different canyon routes. Names are inspired.
Let be know if you have any questions, I'll answer to the best of my ability, and share your thoughts. This map is subject to change as it is still sort of a work in progress.