Concept:
The Harappan Civilization is known for its advanced urban planning, including drainage systems, water conservation, and public structures.
Step 1: Understanding Dholavira.
Dholavira, located in present-day Gujarat, is one of the most remarkable sites of the Indus Valley Civilization.
Step 2: Water management system.
It is especially famous for its highly advanced water conservation techniques, including:
- Large reservoirs
- Step wells
- Channels for rainwater harvesting
Step 3: Unique feature – Stadium.
Dholavira is also known for a large open ground structure interpreted as a stadium or ceremonial ground.
Step 4: Eliminating other options.
- Harappa: Major urban center but not known for a stadium
- Mohenjo-daro: Known for the Great Bath
- Kalibangan: Known for fire altars
Step 5: Conclusion.
Thus, Dholavira is the correct answer.