The “50 degrees” and “100 degrees” refer to geographic coordinates where 50 degrees latitude intersects with 100 degrees longitude. This specific intersection point is one of only four such points on Earth, and the one in Mongolia is among the most accessible. A tourist complex called “50:100” was established at this location in Erkhel valley in the Alag-Erdene soum of Khuvsgul aimag, allowing visitors to experience this rare geographical marker and the crossing has become a notable landmark for visitors.  Unused Mongol Post card.  Grade: 1