The term 'Harbor Feature' can be broken down into two crossword solutions: 'SHORELINE' (9 letters) and 'QUAY' (4 letters). SHORELINE refers to the line where the land meets the sea or a lake, while a QUAY is a structure built along a SHORELINE that provides a place for ships to dock. Both of these features are commonly found in harbors, which are bodies of water that provide protection from storms and other hazards for boats and ships.