Definition of Shoreline:
The intersection between the mean high water line and the shore 
This is the common definition for Shoreline, other definitions can be discussed in the article
The line delineating the shoreline on Nautical Charts (Sea Maps) approximates this Mean High Water (MHW) line.
For more coastal definitions, see also Definitions of coastal terms.
See also the definition of beach face and backshore
- ↑ CIRIA (1996). Beach management manual. CIRIA Report 153.