Forest of Giant Trees (Anime)

A Forest of Giant Trees (巨大樹の森) is comprised of tall trees (generally around 80 meters tall), which have enormous trunks, large branches, and can grow larger than most Titans. Due to their enormous sizes, humans can stay atop the upper branches of the trees and remain safe from Titans, which do not possess the intelligence to climb trees. They are used by the Scout Regiment for certain goals on expeditions. These forests are excellent places to use the omni-directional mobility gear, as there are many tall tree trunks and branches to which the steel cables can secure to, improving versatility and mobility although, in contrast, it is also a perfect place for Titans due to the large tree trunks concealing them and the denseness of the forests reducing visibility of incoming Titans.

The 57th Exterior Scouting Mission arc
During the 57th expedition to the lands beyond Wall Rose, the entirety of the Scout Regiment's outer right flank was wiped out, due to the Female Titan apparently leading an army of Titans. Commander Erwin, the leader of the expedition, signaled the center column to enter the pathway to the Titan Forest, located somewhere between Wall Maria and Wall Rose.

The remaining units, who were not brutally killed by the Female Titan, were ordered to station themselves on the borders of the forest and stop any Titans that attempted to enter. At the other end of the forest, as expected, the Female Titan followed the center column into the forest. She pursued Levi's squad in the forest, brutally killing the Scouts who attempted to kill her.

Soon after, the Female Titan is lured and falls into Erwin's trap, and is held in the forest while protecting the back of her neck, with the Scouts' hopes of capturing the human inside. She later cries for Titans surrounding the forest to eat her alive as to escape her temporary confinement. After the whole of Levi's squad, with the exception of Eren and Levi himself, is brutally murdered by the Female Titan, Eren transforms to battle the Female Titan. After Eren is defeated and kidnapped, Levi and Mikasa attempt to attack the Female Titan and Levi successfully rescues him.

Clash of the Titans arc
After kidnapping Eren and Ymir, Reiner Braun and Bertholdt Hoover stop at a forest of giant trees to rest. They stand in the tree's upper branches to escape the nearby Titans, arguing with their captives while waiting for nightfall. Meanwhile, the military ride for the forest, proceeding under Hange Zoë's deduction that this is where the Warriors would rest. When Reiner and Bertholdt spot the Scouts in the distance, they decide to escape using the trees.

The 104th Cadet Corps group enter the forest and witness Ymir in her Titan form. After Conny tries to get Ymir to talk, Historia appears. Ymir then swallows her and, using the trees, escapes.

Marley arc
Upon his arrival on Paradis Island, Zeke Jaeger is taken to the forest of giant trees by Levi. Zeke appears discontent with the idea of being held in the forest and remarks that the giant trees could provide for great use of the ODM gear. He later asks Levi if he can one day show this natural wonder to Gabi and Falco, however Levi dismisses the question and states that Gabi and Falco's wellbeing depends on Zeke's behavior. Zeke is kept in the forest to be watched over by Levi and thirty other Scout Regiment soldiers.

War for Paradis arc
Following Zachary's assassination, a messenger sends word of the situation to Levi and the other soldiers. Levi tells him to inform Pyxis of his plan to have Zeke fed to any captured Jaegerist. Meanwhile, Zeke is watched over from within the trees, with soldiers ready to swoop down if needed. As Levi is lost in his thoughts, musing how his vow to Erwin will soon be fulfilled, Zeke quickly begins scuttling away. Before anybody can react, he lets out a scream, transforming the scouts in the trees into Titans.

Levi is forced to engage and kill his now Pure Titans subordinates and quickly catches up to Zeke, who in turn transforms into the Beast Titan. Levi uses the trees to hide from the Beast Titan's projectiles then begins cutting down branches to use as diversion, which allows him to defeat Zeke shortly after. Having captured him, Levi drags Zeke away from the forest.

Trivia

 * There are several of these forests in the region between Walls Maria and Rose and they originally functioned as tourist spots.

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