I was messing around with how Chapter 5 regions might map into the existing game, and came up with this.

• Connects Milton to the coast
• unites the two road networks, so you can drive all the way from Bleak Inlet to Suzuki (pre-quakes).
• connects the railway from Mystery Lake to a coastal port for log export, and obviously all the way to TFTFT
• Plausibly allows Jace to get stuck in Blackrock, with the mine shortcut to Suzuki, while maintaining her ability to normally drive there (by going through Milton. Hypothetically there could be a road going directly there from Keeper's Pass as well)
• Desperation Bay is too linear, but it has those two iconic landmarks, so I think the SAR station could go halfway between the ship & the lighthouse.
• Uses the railway to the SAR to connect to Port Mary.
• Plausibly justifies Milton being "halfway between the mountains and Port Mary" - the drive to Suzuki could be "in the mountains"
• Preserves coastal access to Perseverance Wilds

Have I missed anything big?