observationAbout property identifies an entity, often a <a class="localLink" href=https://schema.org/"/Place">Place, associated with an <a class="localLink" href=https://schema.org/"/Observation">Observation." />
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observationAbout

A Schema.org Property

This term is in the "new" area - implementation feedback and adoption from applications and websites can help improve our definitions.
Thing > Property :: observationAbout
The observationAbout property identifies an entity, often a Place, associated with an Observation.

Values expected to be one of these types

Used on these types

Source

https://github.com/schemaorg/schemaorg/issues/2291