🇮🇳 India · Hydraulic works
Kaveripakkam Eri (Tank) — Pallava Hydraulic Reservoir
Medieval Tamil (Pallava–Chola) · Tamil Dravidian (Pallava and Chola imperial)
Pallava eri tank 2.1×1.4 km 740 CE still irrigating 295 ha via tumpu sluices, inscription-documented.