Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with trees and desert) A forest in a dream indicates strife or a group of people gathered for a matter. Entering it indicates entering strife. Exiting it is salvation.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A forest indicates a dangerous place or an unjust ruler. Getting lost in it indicates confusion and fear.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A forest is interpreted as worry. Whoever sees himself in it will be afflicted with worry.