The Annapurna Circuit is a popular name for a trek within the Annapurna mountain range of central Nepal. The total length of the route varies between 160–230 km (100-145 mi), depending on where the motor transportation is used and where the trek is ended. The trek rises to an altitude of 5,400m on the Thorung La pass, touching the edge of the Tibetan plateau. This trek crosses two different river valleys and encircles the Annapurna massif, crossing Thorung La (5416m), the highest pass on this.