The above link is to the vic gov planning webiste
The website says that zones are"
- A zone is a planning provision.
- Zones reflect the primary character of land (such as residential, industrial or rural) and indicate the type of use and development which may be appropriate in that zone.
- There are 25 standard zones for new Planning Schemes to use. Any particular Planning Scheme uses only those zones which are relevant to its area. Each separate holding of land (see cadastre) has 1 zone only.
- The geographic location of each zone is shown in zones detailed maps.
- The written requirements of each zone is set out in the Ordinance.
- Zone provisions can be (but are not always) supplemented by overlayprovisions.
- Select to find out how to use the zones and overlays."