Summit
The Summit is the smallest map in the Valley group, 20 × 30 tiles above the railroad tracks. The game makes no runtime edits to it at all, so there is no repaired state to show, and none of its ground is diggable.
What you can place here
You can place objects, machines, furniture, fences and paths here; crops and buildings stay on the farm.
Other valley maps
Ginger Island NorthGinger Island SouthGinger Island South-EastGinger Island EastRailroadBackwoodsSecret WoodsPelican TownCindersap ForestMountainPelican BeachCalico Desert
Start a plan on any of them from the Valley tab of the New-plan picker in the planner.