An area from which water drains into a particular lake, river, etc.; the catchment area of a large river includes its tributaries.
The area served by a local institution, such as a hospital or school, or by extension, a railway station.
A remote or undeveloped area, a backwater.
The land immediately next to, and inland from, a coast.
Anything vague or ill-defined, especially something that is ill understood.
The rural territory surrounding an urban area, especially a port.
That which is unknown or unexplored about someone.