However, you can use more general terms depending on the context:
* A group of plantations
* A chain of plantations
* A cluster of plantations
* A field of plantations (if referring to a large area)
If you're referring to a specific type of plantation, you might use a more specific term, like:
* A grove of orange plantations
* A belt of cotton plantations
Ultimately, the best choice will depend on the specific situation and what you are trying to convey.