The longest rail tunnel in the world is the Gotthard Base Tunnel, located in Switzerland. This engineering marvel stretches approximately 57.1 kilometers (35.5 miles) and runs through the Swiss Alps. Officially opened in June 2016, the tunnel allows for efficient transportation of both passengers and freight, significantly reducing travel time between northern and southern Europe. The construction of the tunnel took nearly two decades and required advanced engineering techniques to navigate challenging geological conditions. The Gotthard Base Tunnel exemplifies modern engineering prowess and enhances Switzerland’s role as a key transit hub in European transport networks.