Ram Setu, Natural limestone chain between Rameswaram Island and Mannar Island, India and Sri Lanka
Ram Setu is a chain of limestone shoals stretching roughly 30 kilometers through the Palk Strait between southeastern India and northwestern Sri Lanka. The shoals lie mostly just below the water surface and form a natural connection between the two countries, with water depth varying between one and ten meters.
Ancient Sanskrit writings from around 1880 before the common era already mention this formation as a kind of land bridge between the two coasts. A severe cyclone in 1480 destroyed parts of the structure and submerged larger sections underwater, leaving only remnants visible today.
Hindu pilgrims visit the site today to honor the place where, according to religious tradition, Rama directed the building of a bridge to rescue his wife Sita from Lanka. Many believers collect stones along the shore and pray by the water, as the site is considered sacred and linked to this ancient narrative.
The shallow water and irregularly distributed shoals make the area difficult for larger vessels to pass, which is why marked shipping channels must be used. Boat trips from Rameswaram offer visitors the chance to view the formation up close, but should only be undertaken in calm sea conditions.
Geological studies suggest that the formation emerged roughly 3,500 years ago when sea levels were considerably lower than today. The stones show an unusual age structure, with older parts lying on top while younger deposits sit beneath, pointing to a particular origin story.
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