- sea plateau
- sea reclamation works
- sea salt
- sea snow
- sea stack
- sea surface microlayer
- sea surface temperature, SST
- sea water
- sea water chemistry
- sea water conductivity
- sea water density
- sea water desalination
- sea water humus
- sea water ion mobility
- sea water ion-association model
- sea water permeability
- sea water pollutant background
- sea water quality standard
- sea water scatterance meter
- sea water self-purification
- sea water state equation
- sea water transmittance meter
- sea water transparency
- sea-biosphere interface
- sea-land interface
- sea-particle interface
- sea-river interface
- sea-sediment interface
- seacoast
- seamount
- seascarp
- seasonal fluctuation
- seasonal thermocline
- seasonal variation
- Secchi disk
- secondary production
- secondary productivity
- sectional observation
- sediment dynamics
- sediment flux
- sediment humus
- sediment trap
- sedimentary organism
- sedimentation rate
- sedimentation, deposition
- seiche
- semi-diurnal tide
- semi-submersible drilling rig
- sessile organism
- seston