IPA: /træˈmɒn.teɪn/
KK: /træˈmɒnˌteɪn/
Relating to or situated on the other side of a mountain.
The transmontane region is known for its unique climate and biodiversity.
Transmontane → It is formed from "trans-" (meaning across) and "montanus" (from Latin, meaning mountain). The word refers to something that is situated or occurring across the mountains.
Think of something that is 'across' ('trans-') the 'mountains' ('montanus') — that's why transmontane refers to areas or things beyond the mountains.