Belt itself refers to belt, but belt also refers to belt area and conveyor belt. For example:

He wore a belt with a big brass buckle.

He is wearing a belt with a big brass buckle.

The turntable is connected to the motor through a drive belt.

The turntable is connected to the motor through a transmission belt.

Miners in the copper belt in northern Zambia have gone on strike.

Miners in the copper belt in northern Zambia have gone on strike.

Behind him is a forest, behind which are hills and fields.

Behind him is a forest, behind which are hills and fields.