Lets Make a Game Together

Trinity Mountain.
The first cave in the game, yet has the most varied-leveled pokemon encounters depending on where you enter it. Fully accessed postgame.
Fogress Ranch.
The Fogress City Gym Leader owns this ranch. Has a Moo Moo Milk store and 2 sets of Pokemon Daycares. (so you can breed up to 4)
Trinity Mountain Tunnel.
Still has some pokemon encounters albeit fewer because a Train Rail Project is ongoing here. Fully accessed postgame.
Rune Ruins.
Ruins of Rune Desert that is said to be once a developed city destroyed by a rampaging pokemon.
Rune Desert.
A mysterious Desert where the sandstorm was never reported to stop since ancient times.
Einsbolt Power Plant.
Uses both windmills and a manmade waterfall from the Great Basin to generate electricity. Electric-type Pokemon and some Poison-type Pokemon thrive here.
Rune Mountain.
A mountain shrouded in mystery. Unlocked postgame.
Secoia Forest.
A large forest that is home to many kinds of pokemon. Large trees and secrets aplenty.
Cape Mansion.
An abandoned vacation house that is now home to some ghost and psychic pokemon. Fully accessible postgame.
Trainyard Cape.
A place where train cars are stored when not in use. Some Steel-type pokemon can be caught here.
Mountain of Creation West Entrance.
First entrance to the largest Mountain in the region. It stretches up to Ventherea City. Fully accessible postgame.
Mountain of Creation East Entrance.
Can only be entered via Dive HM. Requires Flash. Fully accessible postgame.
Memoir Forest.
A cemetery for humans and pokemon alike. Ghost, Psychic, and Dark Pokemon encountered here.
Justice Forest.
A large forest that can only be fully accessed with Waterfall HM postgame.
Tervari Plateau.
An uphill cavern that is full of Stength HM puzzles. Also has a small cave full of fossils within.
Tervari Shrine Tower.
A shrine that is home to some Grass, Bug, Dark and Ghost-type Pokemon.
Sierra Eclessia.
A mountain range that requires Flash on higher parts. It stretches north to the Aegis Colosseum.
Aegis Colosseum.
Main HQ of Team Aegis.
Ash Tunnel.
A cave route that has the entrance to Ash Volcano.
Ash Volcano.
Home to powerful fire pokemon. Has hidden chambers that are unlocked postgame.
Red Feather Island.
Only accessible by boat. Home to the Fire Lighthouse that hasn't been lit for generations.
East Ruins Island.
Only accessible postgame by Dive. Some Water, Rock Pokemon, and Unown live here. Has a hidden chamber that houses Legendary Pokemon.   
Blue Feather Island.
Only accessible by boat. Home to the Ice Lighthouse that hasn't been lit for generations.
West Ruins Island.
Only accessible postgame by Dive. Some Water, Rock Pokemon, and Unown live here. Has a hidden chamber that houses Legendary Pokemon.
Yellow Feather Island.
Only accessible by boat. Home to the Lightning Lighthouse that hasn't been lit for generations.
Sea Coast Tunnel.
Unlockable postgame. Home to some water pokemon.
Sea Coast Mountain.
Unlockable postgame. Legendary Pokemon are said to sleep within.
Sunken Temple.
A temple located deep beneath a trench. A legendary pokemon is said to sleep here.
Kaleido Island.
Only accessible via boat postgame after acquiring the Kaleido Ticket. The whole island is said to change from time to time for some unknown reason.
Mountain of Creation North Entrance.
Home to the highest-leveled pokemon in Tervari.
Mountain of Creation Summit.
It is said that the creator of Tervari sleeps here.
Chronlesce Forest.
It is said that time flows differently in this forest.
Great Basin/ Tower of Legends.
The center of the whole Tervari region. This is the prime source of water supply for the whole region. It is said that the Tower of Legends shall rise again from the depths of this lake to be the home of the creator.