The World Spatial Database on Protected Areas (WDPA) is the most comprehensive global spatial dataset on marine and terrestrial protected areas available.

Search and Download your Protected Area (FREE)
By registering as a User, you will be able to FREELY download the protected areas selected by using the advanced search tool on the WDPA website. These protected area downloads will be provided in GIS (shapefile) and KML formats.

Visit below for full details:
http://free-gis-data.blogspot.com/2009/04/world-spatial-database-on-protected.html

Thanks for your time!

Sincerely,
The Publisher,
http://free-gis-data.blogspot.com

Note: This site will be updated with more and more free GIS /RS stuff daily, so please keep visiting in future!