What is the Great Bath?

The Great Bath is a large public water tank located at Mohenjo-daro (in present-day Sindh, Pakistan) and is considered the earliest known public water tank in the ancient world. Dating to the 3rd millennium BCE, it was discovered during excavations in the 1920s as part of the citadel complex on the upper mound of Mohenjo-daro, one of the two major urban centres of the Indus Valley (Harappan) Civilization.

The structure is believed to have been used for ritual bathing and religious ceremonies, reflecting the advanced engineering, urban planning, and possibly the religious practices of the Harappan people.

Key Features at a Glance

# Feature Details
1 Dimensions 12 m long x 7 m wide x 2.4 m deep (approx. 40 x 23 x 8 ft)
2 Location Citadel mound, Mohenjo-daro, Sindh (Pakistan)
3 Date 3rd millennium BCE (c. 2500 BCE)
4 Construction Finely fitted baked bricks in standard 4:2:1 ratio
5 Waterproofing Double layer of sawed brick with bitumen (natural tar) sealant between layers
6 Access Two wide staircases — one from the north, one from the south
7 Water supply Large well in an adjacent room
8 Drainage Corbelled drain outlet on the western side
9 Surrounding rooms Small changing rooms along the edges; colonnade on the eastern side
10 Probable purpose Ritual purification / ceremonial bathing

UPSC Exam Corner

Prelims: Key Facts to Remember

  • Site: Mohenjo-daro (NOT Harappa) — in the citadel (upper mound)
  • Dimensions: 12 x 7 x 2.4 metres — frequently asked in factual questions
  • Waterproofing: Bitumen sealant between two layers of brick — shows advanced engineering
  • Brick ratio: Standard Harappan 4:2:1 (length:width:height)
  • Purpose: Likely ritual/ceremonial bathing — not a swimming pool
  • Discoverer: Part of excavations led by John Marshall and R.D. Banerji in the 1920s
  • No similar structure found at Harappa or other Indus sites at this scale

Mains: Probable Answer Themes

  1. "The Great Bath reflects the advanced urban planning and engineering of the Indus Valley Civilization." — Discuss waterproofing, drainage, and construction techniques
  2. "What can the Great Bath tell us about the religious practices of the Harappan people?" — Ritual purity, possible proto-Hindu connections
  3. "Compare the civic infrastructure of Mohenjo-daro with that of contemporary Mesopotamian cities." — Drainage, water management, public structures
  4. "The Indus Valley Civilization was more advanced in municipal planning than its contemporaries." — Use Great Bath as key evidence

Sources: Britannica — Great Bath | Wikipedia — Great Bath | Harappa.com — Great Bath Mohenjo-daro