The VG Resource

https://www.spriters-resource.com/snes/terranigma/

I'm using the European version.

Towns / Villages - Exterior
Loire
Loire (Expansion 1)
Loire (Expansion 2)
Nirlake
Nirlake (Burnt)
Nirlake (Expansion)
Nirlake (Will's House)
Freedom
Freedom (Expansion 1)
Freedom (Expansion 2)
Litz
Litz (Expansion)
Suncoast
Suncoast (Cattle Ranch)
Suncoast (Expansion)
Yunkou
Neotokio
Liotto
Liotto (Night)
Liotto (Statue Area)
Liotto (Night - Statue Area)
Penginea
Lhasa
Crysta
Louran
Louran (Ruins)

Other NPC Areas
Alaska Regions (Tent, Ruins, Stopover)
Caravan
Quatros
Rich's
Poultry Races
Poultry
Molly's
Tollgate
Nomads
Farm (N. America)
Polynese
Australia Regions (Airsrock, Mountain Wall & River)
Asia Regions (Islands)

References:
https://vgmaps.de/maps/snes/terranigma.php
Tool:
bsnes-rawpalettes
Codes:
Walk through Walls: 7E100411 for ON, 7E100415 for OFF
Code Source:
https://tcrf.net/Terranigma
Savefiles:
https://www.zophar.net/savestates/snes/terranigma.html (only tried the first one, which works)
https://fantasyanime.com/legacy/terran_saves.htm (saves all work)

Surprisingly easy to rip, some maps don't even have layers.

This one misses the space without the Quintet building.
Maybe I'll post more WIPs when the areas get bigger and more complicated to rip.