How large can salt domes become below Earth’s surface?

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salt dome Figure 1: Interrelationships of salt structures (see text)

The size of a salt dome varies significantly depending on its specific geological formation. In terms of diameter, these structures typically measure one kilometer or more, with some reaching widths of over 10 kilometers.12

Regarding their vertical extent below the Earth’s surface, a typical salt dome is at least two kilometers high. However, some documented salt domes are known to reach heights exceeding 10 kilometers. These dimensions generally encompass the core of the salt, as well as any associated cap rock and sheath material.1