A Location is a place or position where structure elements can be located or behavior can be performed.

The Location concept is used to model the distribution of structural elements such as Business Actors, Application Components, and Devices. This is modeled by means of an Aggregation relationship from location to structural element. A Location can also aggregate a behavior element, to indicate where the behavior is performed.

Location complexes in Archimate

Source: ArchiMate® 3.0 Specification - Chapter 4.6 Composite elements.

Alongside the breadcrumbs for this item which shows its "ancestry" in concept space, the Child items tab lists its descendants, and the Siblings items tab the concepts that exist under the item's "parent item".