Trans-Andean is a word that describes something that is located on the other side of the Andes mountains. It can be used to describe various things, such as a region, a road, or a railway. Some synonyms for the word trans-Andean are Andean-crossing, Andes-bound, Andes-side, and Andean-pass. These all suggest a location beyond the Andes mountains. Other possible synonyms include Andean-over, Andes-located, Andes-reaching, and Andean-transcending. Each of these synonyms conveys the idea of being on the opposite side of the Andes, and they can be used interchangeably to describe the same location or feature.