Defence structure
Umbrella term for defensive structures that were either purposely constructed in the water or that were once terrestrial and became inundated as a result of sea-level change. A ship trap, sea barrier or harbour facility and be integrated in a defence structure.
A barrier can consist of oblique or vertical wooden piles, stones or log coffins filled with stones [1]
- ↑ Guide for Archaeological Heritage in Finland: underwater defence structure: http://akp.nba.fi/wiki;vedenalainen-estevarustus