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A seven-peaked range in the Eastern Ghats of Andhra Pradesh, home to the Venkateswara temple, the Eparchaean Unconformity and the Seshachalam forests.
The Tirumala Hills are a range in the Seshachalam hill system of the Eastern Ghats, in the Tirupati region of southern Andhra Pradesh. They are traditionally described as seven hills — Seshadri, Neeladri, Garudadri, Anjanadri, Vrishabhadri, Narayanadri and Venkatadri — said to represent the seven hoods of Shesha, the serpent of Hindu cosmology, which is why Tirumala is called Saptagiri or Edukondalu, the seven hills. The Sri Venkateswara temple at Tirumala, administered by the Tirumala Tirupati Devasthanams (TTD), sits on the last of these peaks and is among the most visited pilgrimage centres in the world. For exam purposes the hills matter on three counts at once: as a religious site, as a geological one holding the Eparchaean Unconformity and the Natural Arch, and as an ecological one forming the core of the Seshachalam Biosphere Reserve and Sri Venkateswara National Park.
Type: PhenomenonPart of the Seshachalam range of the Eastern Ghats, spread across the Tirupati and Annamayya (erstwhile Chittoor and Kadapa) districts of Andhra Pradesh
Seven named peaks: Seshadri, Neeladri, Garudadri, Anjanadri, Vrishabhadri, Narayanadri and Venkatadri — the Venkateswara temple stands on Venkatadri
Geologically part of the Cuddapah Basin — quartzites and shales of the Proterozoic Cuddapah Supergroup resting on far older Archaean granites and gneisses
The Eparchaean Unconformity is exposed here: a surface where roughly 2.5-billion-year-old Archaean basement meets younger Cuddapah sediments, representing a gap of hundreds of millions of years missing from the rock record. It is a notified National Geo-heritage Monument
The Natural Arch, locally Silathoranam, is a quartzite arch about 8 m wide and 3 m high formed by weathering and erosion — one of very few natural rock arches in Asia
Core of the Seshachalam Biosphere Reserve, notified on 20 September 2010 as India's 17th biosphere reserve and the first in Andhra Pradesh
Includes Sri Venkateswara National Park, spread over roughly 353 sq km, together with the Sri Venkateswara and Koundinya sanctuary landscape
Flagship species and plants: red sanders (Pterocarpus santalinus), an endemic tree of these hills listed in CITES Appendix II and heavily poached; the golden gecko; slender loris; Indian giant squirrel; leopard and sloth bear
Submitted to UNESCO's Tentative List in 2025 as Natural Heritage of Tirumala Hills (site reference 6894), proposed under natural criteria (vii), (viii) and (x), bundling the Unconformity, the Natural Arch and the Seshachalam forests
Frequency: Moderate to high — the Eastern Ghats, biosphere reserves, red sanders and geo-heritage sites are each recurring UPSC Prelims themes, and Tirumala is the standard example that carries all four
Seshachalam range, Eastern Ghats, Tirupati region, Andhra Pradesh
Seven (Saptagiri / Edukondalu)
Cuddapah Basin — Proterozoic Cuddapah Supergroup over Archaean basement
National Geo-heritage Monument; Archaean-Proterozoic contact
Quartzite arch, about 8 m wide and 3 m high
Notified 20 September 2010; India's 17th, and Andhra Pradesh's first
About 353 sq km
Red sanders (Pterocarpus santalinus), golden gecko, slender loris
On India's Tentative List from 2025 (ref. 6894), natural criteria (vii), (viii), (x)
Tirumala Tirupati Devasthanams (TTD)
An unconformity is a buried erosion surface — a boundary in a rock sequence where deposition stopped for a long stretch of time, the existing rock was eroded, and later sediments were laid on top. The time represented by the missing rock is simply absent from the record. The Eparchaean Unconformity at Tirumala is one of the world's most striking examples because the two sides are so far apart in age: Archaean basement below, Proterozoic Cuddapah sediments above, with an enormous interval unrecorded in between. It is also unusually accessible, exposed along the ghat road up to Tirumala.
Think of a diary in which pages for several decades were torn out and the later entries written directly on the stump. Nothing tells you what happened in those decades except the ragged join — and that join is an unconformity.
Tirumala is the clearest Indian case of one landscape carrying religious, geological and ecological value that pull against each other. Pilgrim traffic on the scale the temple receives requires roads, water, waste handling and construction inside a biosphere reserve and a national park; the red sanders growing on the same slopes are valuable enough to sustain organised smuggling, and enforcement operations in these forests have themselves become news. The 2025 Tentative List submission is an attempt to give all three strands one protective frame. For a Mains answer on reconciling pilgrimage tourism with ecological protection, or on managing geo-heritage in India — which still has no dedicated geo-heritage law, only notified sites under the Geological Survey of India — Tirumala is the most efficient example available.
Tirumala Hills — Seshachalam range, Eastern Ghats, Andhra Pradesh; seven hills, temple on Venkatadri
Eparchaean Unconformity — Archaean basement meets Proterozoic Cuddapah rocks; National Geo-heritage Monument
Natural Arch / Silathoranam — quartzite, about 8 m by 3 m; rare natural arch in Asia
Seshachalam Biosphere Reserve — notified 20 September 2010; India's 17th, Andhra Pradesh's first; not on UNESCO's World Network
Sri Venkateswara National Park — roughly 353 sq km in the same hills
Red sanders — endemic to these Eastern Ghats slopes, CITES Appendix II, heavily trafficked
Golden gecko and slender loris — the fauna to name for Seshachalam
UNESCO Tentative List, 2025: Natural Heritage of Tirumala Hills, criteria (vii), (viii), (x)
The Seshachalam hills of the Eastern Ghats, in the Tirupati region of Andhra Pradesh. They are not part of the Western Ghats.
Seshadri, Neeladri, Garudadri, Anjanadri, Vrishabhadri, Narayanadri and Venkatadri. They are said to represent the seven hoods of Shesha, which is why Tirumala is called Saptagiri or Edukondalu.
A buried erosion surface at Tirumala where roughly 2.5-billion-year-old Archaean basement rock is directly overlain by younger Proterozoic sediments of the Cuddapah Supergroup, with hundreds of millions of years missing from the rock record. It is a notified National Geo-heritage Monument.
The Natural Arch near the Tirumala temple — a quartzite arch about 8 metres wide and 3 metres high formed by weathering and erosion. Sila means rock and thoranam means an arch or garland over a threshold in Telugu.
Pterocarpus santalinus is endemic to this Eastern Ghats tract of Andhra Pradesh. Its dense red timber commands very high prices abroad, so the Seshachalam forests are a focus of illegal logging and enforcement action. The species is listed in CITES Appendix II.