Answer: Mohenjodaro
Notes: Of all the excavated Harappan cities, Mohenjo-daro has revealed evidence of the most sophisticated and well-engineered drainage network. It consists of brick-lined sewers built under many streets collecting water and waste from houses and workshops that flowed out through main outlets to avoid flooding. The advanced sanitation planning demonstrated at Mohenjo-daro signifies the Harappan's ingenuity in civic infrastructure and preventive healthcare policies.
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