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- Environment[remove]17
- Oceans17
- Boundaries9
- Transportation5
- Protected areas3
- Biology and Ecology2
- Coastal zone management2
- Explosives, Military2
- Military2
- Planning and Cadastral2
- Unexploded ordnance2
- Anchorage1
- Boat ramps1
- Contiguous zones (Law of the sea)1
- Economic zones (Law of the sea)1
- Eelgrass1
- Grids (Cartography)1
- Harbors--Traffic control1
- Marine accidents1
- Marine habitats1