Digital World

The Digital World (デジタルワールド, Dejitaru Wārudo), is the home world of the digimon. It is generated from within Earth's computer networks, but exists in a different dimension from the Real World.

File Island

 * Tropical Jungle (トロピカルジャングル) (episode 1)
 * The Ocean (海洋) (episode 2)
 * Unwavering Forest (迷わずの森) (episode 3)
 * The Lake (湖) (episode 3)
 * Gear Savannah (ギアサバンナ) (episode 4)
 * Pyocomon Village (ピョコモンの村) (episode 4)
 * Mount Miharashi (ミハラシ山) (episode 4)
 * Factorial Town (ファクトリアルタウン) (episode 5)
 * Sewers (地下水道) (episodes 5-6)
 * Vending Machine Field
 * Toy Town (おもちゃの町) (episode 6)
 * Mugen Mountain (ムゲンマウンテン) (episode 7-8)
 * Cottage (コテージ) (episode 8)
 * Freezeland (フリーズランド) (episode 9)
 * Ancient Dino Region (ダイノ古代境 Daino Kodaikyou) (episode 10)
 * The Ancient Temple / The Digivice Temple (episode 10)
 * Wall of Fire (episode 53)
 * Overdell Cemetery (オーバーデル墓地 Ōbāderu Bochi) (episode 11)
 * Village of Beginnings (はじまりの街, Hajimari no Machi) (episode 12)
 * Devimon's Castle (デビモンの城 Debimon no Jyou) (episode 13)

from: Digimon Adventure Official Encyclopedia (デジモンアドベンチャー公式大図鑑) pages 18-19.

The Ocean

 * The Sea (海) (episode 14)
 * Underwater Cave (海底洞窟 Kaitei Doukutsu) (episode 14)

Server Island

 * Landing Point (上陸地点, Jōriku Chiten) (episode 14)
 * Koromon Village (コロモンの村, Koromon no Mura) / Pagumon Village (パグモンの村, Pagumon no Mura) (episode 15)
 * The Colosseum (コロシアム, Koroshiamu)(episode 16)
 * Luxury Liner (豪華客船, Goukakyakusen) (episode 17)
 * Piccolomon Forest (ピッコロモンの森, Pikkoromon no Mori) (episode 18)
 * Reverse Pyramid (逆ピラミッド, Gyaku Piramiddo) (episode 19-20)
 * Amusement Park (遊園地, Yuenchi) (episode 22)
 * Vegiemon's Shop (ベジーモンの店, Vegimon no mise) / Digitamamon's Shop (デジタマモンのお店, Dejitamamon no Omise) (episode 23)
 * Vademon's Den (ベーダモンの巣, Bēdamon no su) (episode 24)
 * Tonosama Gekomon's Castle (トノサマゲコモンの城, Tonosama Gekomon no Shiro) (episode 25)
 * Vamdemon Castle (ヴァンデモン城, Vandemon Jou) (episode 26)
 * Gennai's Home (ゲンナイの家, Gennai no Ie)
 * Jungle Area (ジャングル地帯, Janguru Chitai)

Spiral Mountain
Spiral Mountain (スパイラルマウンテン Supairaru Mauntin) is the transformation of the Digital World into one large mountain by the Dark Masters. This happened while the Chosen Children were back in the Real World and fought Vamdemon. It was divided into four sections:
 * Digital Ocean
 * Digital Forest
 * Digital City
 * Wasteland