# Shipping zones

Shipping zones determine the available [shipping methods](https://docs.commercelayer.io/core-api-reference/shipping_methods) for a given shipping [address](https://docs.commercelayer.io/core-api-reference/addresses). The match is evaluated against a set of RegEx on the address country, state, or zip code.

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<summary>Data model</summary>

Check the related [ER diagram](https://commercelayer.io/docs/data-model/shipping-zones-and-methods) and explore the flowchart that illustrates how the shipping zone resource relates to the other API entities.

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