Areas

Neighborhood
Area A

Is your home, it is an area in your Neighborhood.

Area B
The "Neighborhood". Asgore, Napstablook's Home and Napstablook, Sans and Papyrus's Home, Dr.Alphys' s Home and Dr.Alphys can be located in there. Oher possible residents are: Mettaton, Undyne and the Annoying Dog.

Area C
It is the area with the library, Grillby's, and school.

Snowdin
Same as Undertale

Hotland
Same as Undertale

Waterfall
Same as Undertale

Asgore's Castle
The area where you fight Flowey.

Upper Area
We only see the entrance.

Basement
Where Alphys set up her new lab.

Field
Where you fight enemies.

Forest
Where you meet Sans.