Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by location or context]
8. [single built works by location: topographical]
9. marine structures

Anotations

Scope note:

Use only for structures built adjacent to the continental land masses and on the continental shelves, often located within the navigable areas of coastal waterways; use "marine structures" for construction built seaward of high-water lines of oceans, seas, or bays.