A functional region is a type of geographic area defined by a particular set of activities or interactions that occur within it. Unlike formal regions, which are defined by clear boundaries (like countries or states), functional regions are defined by the connections or functions that occur within them.

These regions are often organized around a central node or focal point, and the surrounding areas are linked to this center through various social, economic, or transportation activities. The strength of these connections decreases as you move farther from the central hub.

Examples of functional regions include:

1. Metropolitan areas (e.g., New York City) – The central city and its surrounding suburbs are linked by transportation networks, economic ties, and social interactions.
2. Shipping zones – Areas where goods are shipped and received based on logistics and transportation hubs.
3. Broadcast areas – The region that receives a particular radio or television signal from a broadcast station.

In essence, a functional region is defined by its purpose or activity, and its boundaries are not rigid, but instead depend on the extent of the interactions within it. Would you like more examples or further details on functional regions?