Which zone is known as the manufacturing zone?

Manufacturing zones are the zones or properties which are used for manufacturing activities and the permit is given through a zoning ordinance. You can read about the National Investment and Manufacturing Zones (NIMZ): Notes for UPSC in the given link.

Further readings:

1. Special Economic Zone (SEZ) – Definition, Rules, Objectives
2. National Manufacturing Policy (NMP) – Significance, Objective (UPSC)