As the name implies, the Ancient Forest consists of a massive forest, but is also comprised of clearings close to the coast and a combination of cliffs and massive trees that creates a vast vertical space.
This section of the map is comprised of mid-sized grasslands surrounded by the forest. Many groups of herbivores can be found here, including Aptonoth and the New World's Kestodon. Other monsters that frequent this area include Jagras, Great Jagras, Kulu-Ya-Ku and Anjanath, who wander around these parts in search of food.
The lower forest is thick and lush with greenery, which provides the perfect environment for Pukei-Pukei to camouflage itself. Great Jagras, Tobi-Kadachi, Rathian and Anjanath also wander these parts. This is a great location for collecting plants and mushrooms. Groups of Mosswine can be found here, and many sections contain bodies of water where Gajau can be seen.
High in the cliffs and branches of massive trees, one can find the nests of wyverns such as Rathalos. Most monsters found in the shorelines or the lower forest don't come here unless provoked, and they'll generally attempt to flee if the King of the Skies or another powerful monster makes its entrance.
Small monsters - Aptonoth, Boaboa, Gajalaka, Gajau, Grimalkyne, Jagras, Kestodon, Mernos, Mosswine, Vespoid
Native Large Monsters - Anjanath, Tobi-Kadachi, Kulu-Ya-Ku, Great Jagras, Pukei-Pukei, Leshen, Ancient Leshen, Narcacuga, Rathian, Rathalos, Azure Rathalos, Blackveil Vaal Hazak
Invasive Large Monsters - Fulgur Anjanath, Banbaro, Bazelgeuse, Deviljho
Savage Deviljho, Ebony Odogaron, Glavenus, Kushala Deora, Nightshade Paolumu, Rajang, Ruiner Nergigante, Tigrex, Velkhana, Yian Garuga, Scarred Yian Garuga, Zinogre