NPCA Watershed Explorer - interactive mapping site for viewing water and environmental map layers
NPCA Watershed Health
Regional Niagara Environmental Areas [map] G 3463 N54 G3 2001 N53
Niagara Peninsula Conservation Authority Sub-watersheds [map] G 3462 N53 C315 2004 N53 (Also available in Watershed Explorer)
Natural Areas Inventory 2006-2009 [book] QH 77 C2 N535 2010 v.1-2 (Also available as GIS data)