Is this 30-mile chain of shoals a natural wonder or a divine construction?

Countries & Cities · Published 30 September 2026 Swipe more like this →

In short: Spanning the waters between India and Sri Lanka, Adam’s Bridge is a mysterious, shallow formation that has challenged sailors for centuries. While geologists point to tectonic shifts and coral growth, others see the remnants of an ancient, epic causeway. It remains a site of intense scientific and cultural debate.

Adam’s Bridge is a 30-mile (48 km) chain of sandbanks and shoals connecting Rameswaram Island in India to Mannar Island in Sri Lanka. It acts as a natural barrier, separating the Palk Strait from the Gulf of Mannar. With many sections less than 4 feet deep, the formation has long been a significant obstacle to maritime navigation, forcing larger vessels to circumnavigate Sri Lanka entirely.

The origin of the bridge is a subject of both geological study and religious tradition. Geologically, it is viewed as a former land connection that may have been exposed during periods of lower sea levels. Some theories suggest that tectonic movements and coral accumulation trapped sand to form the structure, while others propose that longshore currents deposited the material. Estimates for its formation vary wildly, ranging from 125,000 years ago to as recently as 3,500 years ago.

Culturally, the site is deeply significant. In Hindu tradition, it is known as Rama Setu, believed to be a causeway built by the god Rama and his army to rescue his wife, Sita. Muslim legend offers a different narrative, suggesting the bridge was used by Adam to reach Adam’s Peak in Sri Lanka. The name Adam’s Bridge itself likely emerged during the era of the scholar al-Bīrūnī, who lived between 973 and 1052.

Attempts to tame the passage began in the 19th century, with dredging operations starting in 1838. These efforts, along with later proposals like the 2005 Sethusamudram Shipping Canal Project, have faced persistent hurdles. Beyond the technical difficulty of maintaining a channel against monsoons, projects have been stalled by concerns over environmental impact, potential loss of thorium deposits, and strong opposition from those who view the bridge as a sacred, historical monument.

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