Shoreline

The boundary between the land and a body of water
Real World Example
Imagine trying to keep your house tidy while your kids play with their toys. Just as it's challenging to maintain a clear boundary between clean and messy spaces at home, the shoreline represents the boundary between land and water, constantly shifting and changing with the tides. The clutter of toys represents the water's ebb and flow, while your efforts to tidy up mirror the shoreline's attempt to maintain a distinct line between the land and the sea.
Real World Example Illustration
Practice Version
