The phrase "untouched forests" refers to forests that have not been interfered with or changed by humans. It means that these forests have been left in their natural state without any human alteration. Full definition
The lodge is nestled among trees in virtually untouched forest, designed to be in complete harmony with its environment. (wikiaustralia.com)
Here's a testimony to the resiliency of tropical forests: Mongabay points out that a study in the journal Conservation Biology shows that, if managed properly, forests which have been logged can return to levels of biodiversity found in untouched forests in just 15 years: Dr David Edwards of the University of Leeds examined forests in northeastern Borneo which had been logged 20 years ago. (treehugger.com)
Weave through untouched forest guided on horseback with a panoramic ocean view. (10best.com)