The main feature of the Harappa Civilization was town planning. The Harappa Civilization, also known as the Indus Valley Civilization, was one of the earliest urban civilizations in the world, flourishing in the Indus River valley in present-day Pakistan and northwest India from around 2600 BCE to 1900 BCE.

Town planning in the Harappa Civilization was highly advanced and showcased remarkable urban development for its time. The cities of the Harappa Civilization were well-planned and organized, with a sophisticated layout that demonstrated the civilization's high level of social and administrative organization.

The main features of town planning in the Harappa Civilization were:

1. Grid Layout: The cities were designed on a grid pattern, with streets laid out in an organized manner. The streets intersected at right angles, forming a grid-like network. This grid layout provided easy access to different parts of the city and facilitated movement and transportation.

2. Well-Planned Streets: The streets in the Harappa Civilization were wide and well-constructed. They were paved with bricks and had drainage systems to channel rainwater away from the city. The well-planned streets ensured efficient circulation and prevented waterlogging during monsoon seasons.

3. Citadel and Lower Town: The cities were divided into two distinct areas - the citadel and the lower town. The citadel was a fortified area located on elevated ground and housed important administrative and religious buildings. The lower town, surrounding the citadel, was where the majority of the population lived. This division of the city into different zones served both administrative and defense purposes.

4. Advanced Water Management: The Harappa Civilization had an advanced system of water management. Cities were equipped with well-planned and well-maintained drainage systems, including underground sewers and covered drains. These systems were designed to efficiently dispose of waste and prevent the spread of diseases.

5. Standardized Building Materials: The Harappa Civilization used standardized building materials, such as bricks, for construction purposes. The bricks were made of uniformly-sized dimensions, which allowed for precise construction and ensured the stability of buildings.

Overall, the town planning of the Harappa Civilization demonstrated a high level of organization, efficiency, and foresight. The grid layout, well-planned streets, division of the city into different zones, advanced water management, and standardized building materials all contributed to the remarkable urban development of the Harappa Civilization.