The Mountain Sector
The Mountain Sector (also called the Mountain Region in Season 1) is one of the four surface sectors of Lyoko.
The mountains of the Mountain Sector are shrouded in fog, but more fog is covering the Digital Sea. This sector is filled with floating platforms with mountains, moving platforms and narrow pathways. Due to this, it can be hard to find towers. Normally, when towers are activated in this sector, Kankrelats, Bloks and Hornets guard them because they have the advantage in this sector. In some instantces in Season 4, Mantas guarded the activated towers as well.
Appearances by the Scyphozoa and other monsters have happened as well. As seen in several episodes like Laughing Fit and A Great Day, the Mountain Sector is made of two levels and when the Lyoko Warriors jump off a platform on the upper level, they are found in a lower part of the sector, as first chronologically shown in X.A.N.A. Awakens. This sector was destroyed by Aelita by entering the Code X.A.N.A. in the way tower in Double Trouble, being the last of the four surface sectors to survive.
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Vegetation is rare, in the form of sparsely populated bonsai trees. In the first season, apart from the trees, the Mountain Sector also featured scattered roots on the platforms and rocks here and there.