A ridge, usually of rocks or coral, lying near the surface of the sea, which may be visible at low tide, but is usually covered with water
Data Dictionary for reef_poly: apps.linz.govt.nz/topo-data-dictionary/index.aspx?...
Further information on Topo50:
|Data type||Vector polygon||Feature count||16|
|Services||Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W), data.govt.nz Atom Feed|