The ancient Indus Valley Civilization had sophisticated town planning principles between 15,000-3,000 BC. Cities were located along rivers for water and fertile soil. Streets were laid in a grid pattern divided into blocks. Central open areas and underground drainage systems served groups of houses. Later Indian texts from 6th century AD elaborate detailed rules for ideal city layout, architecture, and classification of settlements. Mohenjo-Daro exemplified these principles with planned streets and drainage. Town shapes recommended included square, rectangle, circle, and ellipse to align with cosmological beliefs.