From active volcanoes and mud volcanoes in the Andamans to the ancient multi-faith landscape of Sirpur, three very different Indian sites have entered UNESCO’s Tentative List.

India's natural and cultural heritage is often much stranger and more diverse than the places most people know. Some of its most unusual landscapes have been shaped by volcanic activity and shifting tectonic plates, while others preserve evidence of centuries of trade, religion and urban life.

That diversity was reflected in September 2026, when three very different Indian sites were added to UNESCO's Tentative List: the Karst-mud-volcano Complex of Baratang, the Andaman Subduction Volcanoes, and the Sirpur Cultural and Archaeological Landscape. UNESCO's current records list all three with a submission date of September 28, 2026, taking India's Tentative List to 81 sites.

Being placed on the Tentative List does not mean these places have already become UNESCO World Heritage Sites. It is part of the process through which countries identify sites they may later nominate for World Heritage status. The individual sites still have to go through further documentation, nomination and evaluation.

Baratang: Where Caves and Mud Volcanoes Tell a Geological Story

On Baratang Island in the Andaman and Nicobar Islands, the proposed site combines two unusual geological features: a limestone karst landscape containing caves, and mud volcanoes.

The limestone caves have developed through the slow dissolution of rock over long periods, creating fissures, cavities and underground passages. The landscape also contains speleothems such as stalactites and stalagmites, formed as minerals are deposited by water moving through the rock. UNESCO describes the area as an important record of geological and ecological processes, with the cave environment also supporting specialised biodiversity.

The mud volcanoes are even more unusual. Despite their name and shape, they are not formed by molten rock. They release relatively cool mixtures of mud, water and gases driven upward by geological processes involving pressurised sediments and tectonic activity.

UNESCO's submission notes that Baratang's mud volcanoes are associated with the tectonic setting of the Andaman region and are considered significant for understanding geological processes in the area. The site also contains the only recorded mud volcanoes of this kind in India.

The combination makes Baratang unusual: a tropical island landscape where underground caves, mud volcanoes, forests and biodiversity exist within a region shaped by the movement of tectonic plates.

Barren Island and Narcondam: Two Volcanoes, Two Different Stories

The second new entry is the Andaman Subduction Volcanoes, centred on Barren Island and Narcondam Island.

The two islands are part of the volcanic arc created by the subduction of the Indian Plate beneath the Burma microplate. Although they belong to the same broader geological system, they represent very different stages of volcanic and ecological history.

Barren Island is South Asia's only active volcano. Its recorded eruptions stretch back to 1787, with further activity documented in the modern period. The island's continuing volcanic activity repeatedly alters its landscape, creating an unusual natural laboratory for observing how plants and other organisms return after volcanic disturbance.

Narcondam tells a quieter story. The volcanic island has been dormant for a very long period, allowing forests and highly specialised species to develop in isolation. It is home to species found nowhere else, including the Narcondam Hornbill and the Narcondam shrew.

Together, the islands allow scientists to study two sides of island evolution: how life repeatedly colonises land disturbed by volcanic activity, and how isolation and long periods of stability can produce unique species and ecological communities.

Sirpur: An Ancient City Shaped by Many Traditions

Thousands of kilometres away, in Chhattisgarh, the Sirpur Cultural and Archaeological Landscape represents a completely different kind of heritage.

Located on the eastern bank of the Mahanadi River, ancient Sirpur, or Shripura, developed as an important political, religious and commercial centre. UNESCO's description places its surviving archaeological landscape broadly between the 5th and 12th centuries CE.

The remains include Hindu temples associated with Vaishnava and Shaiva traditions, Buddhist monasteries and viharas, residential structures, learning centres, market and commercial areas, water-management systems and riverfront infrastructure.

What makes Sirpur particularly significant is the way these different elements exist within the same historical landscape. The town developed through interactions between religious communities, rulers, artisans and merchants, while its position along the Mahanadi helped connect it to wider commercial networks.

The Lakshmana Temple, Buddhist remains and other archaeological structures provide evidence of the architectural and technological capabilities of the period. Excavations have also revealed evidence of occupations including metalworking, pottery, gold work and bead making, offering a glimpse into the economic life of the ancient settlement.

Three Sites, Three Different Windows Into India

What makes these additions interesting is that they do not represent one narrow idea of Indian heritage.

Baratang preserves evidence of geological processes and a complex relationship between caves, forests and volcanic activity. Barren Island and Narcondam show how volcanic landscapes can shape the evolution of life over time. Sirpur, meanwhile, preserves the physical remains of an ancient urban landscape where religion, trade, architecture and political life developed alongside one another.

Together, they also show why a country's heritage cannot always be understood through its most famous monuments.

Some places tell their stories through temples and archaeological remains. Others tell them through rocks, caves, volcanoes and the species that have adapted to isolated environments.

Tentative List Is Only the Beginning

There is an important distinction between being on UNESCO's Tentative List and being a World Heritage Site.

The Tentative List is essentially a country's inventory of properties it may consider for nomination in the future. Inclusion does not guarantee inscription. A site must go through the formal nomination and evaluation process before the World Heritage Committee can decide whether it should be inscribed.

For these three Indian sites, therefore, September's additions are an early step rather than a final designation.

But they still matter. They place some extraordinary parts of India's natural and cultural landscape into a global heritage framework and create a stronger basis for documenting what makes them significant.

From the volcanic islands of the Andaman Sea to the archaeological remains beside the Mahanadi, these places remind us that India's heritage is not one single story. It is geological, ecological, architectural, cultural and deeply layered, sometimes in ways that are only beginning to receive wider recognition.

Related Stories