Reefbase is a global online information system (www.reefbase.org) on coral reefs. It provides information services to coral reef professionals involved in management, research, monitoring, conservation and education. Reefbase's online geographic information system (GIS) allows the display of coral reef related data and information on interactive maps. One can zoom in to a particular area of interest, switch various data layers on and off, and save or bookmark the map for later viewing, printing or use in presentations/documents.