A zone is an abstraction of space. All zones should have one or more Links to other zones.
The exact dimensions of a zone don’t matter, and can vary depending on the Pace of the game. During Beats and Turns, a zone will typically be a single room. Particularly large rooms might be broken into several zones. When exploring, a zone size of around 5 km is used.
Zones are used to track where characters are during combat and exploration. They also determine the range of spells and ranged weapons, and can be used to apply effects to different areas.
Zones might be affected by cover, difficult terrain, or other effects as per the GM’s discretion.