Elephanta Island Stepped Reservoir: ASI’s 1,500-Year Find
Why in the news
Archaeologists of the Archaeological Survey of India (Mumbai Circle) exposed an ancient built water tank on Elephanta Island off Mumbai. The find points to advanced water management and confirms the island’s role in 6th-century maritime trade.
Key facts
- Site: Elephanta Island (Gharapuri), Mumbai Harbour, about 10 km east of the city; excavation started November 2025.
- Structure: T-shaped stepped reservoir, 14.7 m long, 6.7 to 10.8 m wide.
- 20 stone steps lead down to 5 m.
- Built of stone blocks brought from the mainland, unlike earlier rock-cut cisterns on the island.
- 60 coins found, many of Krishnaraja of the Kalachuri dynasty.
| Find | Detail | What it shows |
|---|---|---|
| Reservoir | T-shaped, 20 steps, 5 m deep | Rainwater harvesting where rock stops seepage |
| Copper coins | Seated bull on one side; temple symbol and “Sri Krishnaraja” on the other | Kalachuri administrative presence |
| Amphorae sherds | About 3,000 | Integration into long-distance trade |
Background
- Elephanta: the “City of Caves”, famed for rock-cut temples carved between the 5th and 7th centuries; a UNESCO World Heritage site.
- The rocky ground does not absorb monsoon rain, so the tank captured runoff before it reached the sea.
- Early Kalachuris (of Mahishmati) ruled parts of West-Central India in the 6th-7th centuries, were Shiva devotees and are widely seen as builders of Cave 1.
- Amphorae: tall two-handled Greek or Roman jars.
Exam angle
- Agency: ASI; ruler: Krishnaraja; dynasty: Kalachuri.
- Related terms: Gharapuri, numismatics, amphorae.
- Useful for UPSC GS-1 heritage and SSC GK on monuments.