Geography:
Sinnoh features a broad range of new and classic environments for the player to explore including, for the first time in a Pokémon RPG, snowy routes. The region also features full-land geography, with only five sea routes. Despite this lack of sea routes, a direct opposite of the Hoenn region, the Sinnoh region is known to be rich in water, and has three lakes at the northernmost (Acuity), easternmost (Valor), and westernmost (Verity) ends of the main continent that are home to the members of one of the legendary trios of Sinnoh. Near Lake Valor, as well, there is a hidden fourth lake, Sendoff Spring, which houses Turnback Cave.
Due to its large size, the main continent of Sinnoh can be broken into two sub-regions divided by Mt. Coronet, roughly comparable to how the continent that Kanto and Johto make up is essentially a contiguous region. Due to this, Shellos and Gastrodon have developed an instance of regional speciation, with members of the species found on the eastern side being blue-colored and members on the western side being pink-colored.
The western half of Sinnoh features a variety of landscapes. Its coasts are notably more rocky than the eastern half, however, the land is far more fertile, and the towns, for the most part, are rural. A windswept canyon, carved out by a river that flows from Mt. Coronet, is home to the Valley Windworks, which provides clean, wind-driven electricity to the nearby towns. This is not to say, however, that there is no importance to west Sinnoh, as Oreburgh City, Eterna City, and Canalave City are the locations of Pokémon Gyms, and Jubilife City, at the heart of the area, is the most technologically advanced city in the region.
Sinnoh's eastern half is home, however, to a vast many more things, including Pokémon Super Contests in Hearthome City, a Department Store in Veilstone City, the Great Marsh of Pastoria City, and the awe-inspiring Vista Lighthouse of Sunyshore City. In each of these cities, as well, there is a Pokémon Gym, which is very important for League-bound trainers.
Unlike the halves of Sinnoh divided longitudinally by Mt. Coronet, the northern area is sparsely populated, with Snowpoint City as the only major area, likely due to the harsh snows that blow down from the mountain's peak, making the area not only very cold, but as well making a trip northward very perilous. Despite this relative isolation, however, Snowpoint as well has a Pokémon Gym, making it another important stop for trainers who wish to compete in the Pokémon League.
A third sub-region is the Battle Zone, which is on a large island to the northeast of the mainland. Much like how people from the Sevii Islands seem to consider their home to be a separate region from Kanto and Johto, people from the Battle Zone often refer to Sinnoh as a separate region. Several islands, including Newmoon Island, Fullmoon Island, and Iron Island, lie off the northwestern coast of Sinnoh as well, though these are far eclipsed in both size and importance by the mainland.

Towns and Cities:
Western Sinnoh
Twinleaf Town
Sandgem Town
Jubilife City
Oreburgh City
Eterna City
Snowpoint City
Canalave City
Floaroma Town
Eastern Sinnoh
Veilstone City
Pastoria City
Hearthome City
Sunyshore City
Celestic Town
Solaceon Town
Pokémon League
Northeastern Island (Battle Zone)
Fight Area
Survival Area
Resort Area
Battle Frontier
