What is the longest tunnel in the world?

The Delaware Aqueduct is indeed one of the longest tunnels in the world. It spans approximately 137 kilometers (about 85 miles) and serves as a water supply pipeline for New York City, transporting water from the nearby reservoirs to the city.

While there are other significant tunnels that surpass this length, the distinction of the longest tunnel currently belongs to the Gotthard Base Tunnel in Switzerland, which measures about 57 kilometers (approximately 35.5 miles) in rail section alone but has an overall length of over 151 kilometers (94 miles) when considering all its systems and approaches.

The Channel Tunnel, primarily a rail tunnel connecting England and France, and the Seikan Tunnel in Japan, which is designed for rail travel under the Tsugaru Strait, also have impressive lengths but do not match the extensive reach of the Delaware Aqueduct in terms of pure infrastructure designed for water transit.

Overall, the understanding of these tunnels offers insights into the engineering feats accomplished in various fields, from transportation to utility management, highlighting the significance of the Delaware Aqueduct in the context of infrastructure dedicated to critical resources.