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UPDATED AS OF 06/13/13

The Tervari Region
Disambiguation: Terra[land, ground, earth] + Varietas[variety, diversity, difference]
Can be translated as "Diverse Land" or "Land of Different People and Places".

Region Description
Tervari is a very big and diverse region, taking up two map screens (a la Kanto x Johto), however it is divided into a north sub-region and a south sub-region. (If we base on the ds emulator, each screen can show one sub-region)

North Tervari is basically composed of highlands such as a tundra area, a plateau, a mountain range and the pokemon world's highest mountain, the Mountain of Creation, where the region's Creator is said to reside. Compared to South Tervari, the north is more rural, but is rich in tradition and folklore. It features a city composed of treehouses (a la Fortree City) which has the Tree of Knowledge in its core (a humongous Library Treehouse) and a japanese-themed city that is dubbed 'The First Hamlet of Tervari' which is now the most populated area in the region(and possibly the world), taking up a whole plateau in size and housing 3(!) gyms. Three rivers flow from the northern part of North Tervari to the largest lake in the world, the Great Basin, which is rumored to have great secrets within. It is surrounded by a peculiar mountain range formation which makes it look like a literal basin. On the Southeast part is Ash Mountain, an active volcano which spews ash more often than lava. On the southwest is Rune Desert, a desert that was said to be a city that got pulverized when a powerful pokemon rampaged.

South Tervari is mostly urbanized, and is split into east and west by the Tervari Canyon, which stems from the mountains that hold the Great Basin. The long coastline of South Tervari is made up of white sandy beaches, stretching from west to east. On the sea are some islands accessible by boat. Most notable are the Red Feather Island, Yellow Feather Island and Blue Feather Island, in which 3 ancient lighthouses stand. These lighthouses are said to be pokemon-made, and as to why pokemon built them is currently unknown. Local folklore states that Legendary Pokemon sleep within each island.

Formerly in the eastern coast of South Tervari, the Pokemon League is now situated at the center of the subregion, directly at the end of the Tervari Canyon.

Map legends:
Names in Black means the area is fully accessible before Elite 4.
Names in Red means the area is only unlocked after Elite 4.
Names in Green means the area is accessible before Elite 4 but access is limited until after Elite 4.
City/ Town Legend

Luxuria City Suburbs.
This is where your house is. At postgame, The Luxuria Mayor opens his mansion's backyard to the public, where you could find some pokemon not native in the region.
Luxuria City [1st gym: Normal-type].
Quite a big city and has the Pokemon Lab and the Xtransciever[?] Dev't Company.
Luxuria Resort.
Unlocked Postgame, kinda like a Join Avenue, and everyday a catchable starter pokemon plays here.
Coastlink City.
A port city, but you won't use any of the boats here. Super Rod is obtainable here. The Pokemon Hotel is a place where you can battle some gym leaders and/or champions in Tervari and other regions with high-level teams. The people available change everyday. This city is unlocked postgame.
Stardom Valley(?)
A “minigame” center where R/S/E Contests, Pokeathlon and Pokestar Studios are gathered in one place. Only accessible postgame.
Prowesce City [2nd gym: Fighting-type].
Has a Pokemon School. Also has the Pokemon Tablet PC Inc., or PokeTab Inc. for short.
Fogress City [3rd gym: Flying-type].
A big trade city with a department store. Also has a battle restaurant/café where the Name Rater hangs out.
Basin's Spout.
Essentially a Pokemon Park.
Cresciege Town.
A stronghold town of Team Aegis.
Einsbolt City [4th gym: Electric-type].
A city with a power plant that powers the Tervari Railroad Transit.
Westream City [5th gym: Ground-type].
An Oasis city. Many vendors/item traders here.
Verisil City [6th gym: Grass-type].
A treehouse city. Houses the Tree of Knowledge, the biggest library in the region. Also has the PokeGreenhouse where you can grow berries. Pokemon sometimes gather depending on the berries planted. 
Tournament Island.
An island accessible by train where people from around the world gather to participate in the Battle Frontier and the Pokemon World Tournament.
Ventherea City [7th gym: Poison-type].
Basically a Pokemon Lab and Weather Lab town. Most residents are researchers.
Safari Zone.
Developed by Ventherea City to study pokemon in their natural habitat.
Arcavis Town [8th gym: Psychic-type].
A town taken over by Team Aegis. Gym Leader's whereabouts unknown. The Aegis Trieres, a big warship, is docked here.
Tervari Hamlet [9th-11th gym: Ghost, Dark and Bug-type].
Ironically the most populated city in the region. A Japanese-themed city, it has a whopping 3 gyms whose gym leaders will challenge you to a triple battle when you beat them once each.
Sierravasse Town.
A town that has an 'elevator' irrigation system to carry water supplies from the Great Basin to Tervari Hamlet.
Sunfalzen City [12th gym: Fire-type].
The biggest port city [and second biggest city] in Tervari. The Gym Leader uses the Old Pokemon League building as his gym before postgame. Afterward he returns to his own Gym Building. Sunfalzen has a sewer system that is home to some poison, dark and water pokemon.
Victory Road Entrance.
Has numerous gates that open if you have the required badges. Has a Trainer House with some trainers preparing for the arduous Victory Road.
Victory Clearing.
A mountain clearing which signifies that you cleared Victory Road. Has gates to enter either the Victory Hall or the Victory Tube.
Pokemon League/ Pokemon League Ruins.
This is the new Pokemon League Building. Destroyed by Team Aegis during endgame.
Old Pokemon League Bldg./ Pokemon League.
Used by the Sunfalzen Gym Leader as his gym, but became the new Pokemon League Bldg. at postgame.
Logbend Town.
A laidback town that was unaffected by Team Aegis' sieges. Team Aegis backstory is explained here. Unlocked Postgame.
Riverclog Town.
A mountaineer town. Information about the legend of the Mountain of Creation is explained here. Houses the Riverclog Temple, a temple filled with monks itching to battle. Unlocked Postgame.
Conferica Town.
The Champion's and the Team Aegis Leader's town. Does not welcome outsiders too much because of its tradition. Has an Herbal store to buy bitter medicine and incenses. The treehouse shrine is a place to pray for bountiful harvest. Unlocked Postgame.