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]

Narrower term/s

• offshore structures
• submarine structures

Anotations

Scope note:

Structures built in relation to water in general, especially seaward of the high-water line of the major water bodies (oceans, seas, bays); use "offshore structures" for construction built on continental shelves.