Small Island Developing States Network - SIDSnet
UN Atlas of Oceans
Vital Water Graphics: An Overview of the State of the World’s Fresh and Marine Waters
GIWA - Global International Waters Assessment
Global Programme of Action for the Protection of the Marine Environment from Land Based Activities  (GPA)
Coral Reef Unit
The International Coral Reef Action Network (ICRAN)
Regional Seas Branch
Global Environment Outlook
World Conservation Monitoring Center
World Atlas of Seagrasses
Technical Cooperation Unit
Earthwatch
 

UNEP-WCMC Publications

World Atlas of Seagrasses
Details
Information
IMapS
Purchase and Description

World Atlas of Coral Reefs
Details
Information
Purchase and Description

World Atlas Of Biodiversity
Information
IMapS
Purchase and Description

From Ocean to Aquarium Report
Full Report (PDF)
Information

Global Marine Assessment Report
Cover (PDF)
Full Report (PDF)

Marine Turtles IMapS
Presspack
IMapS (Interactive Map Service)

Mangroves of East Africa Report
Full Report PDF
 

Web based sources for coral reef information
 

UNEP-Coral Reef Unit
International Coral Reef Initiative
International Coral Reef Action Network
UNEP-WCMC/ Project Aware/ NOAA (2003) 
United Nations Oceans Atlas
BBC Blue Planet
International Coral Reef Information Network (ICRIN)
ICRIN Teachers Resources
The Reef Education Network
Ocean Futures
Monterey Bay Aquarium
Reef Check
NOAA Coral Reef Information Site
The Marine Life Information Network for Britain and Ireland
PADI Project AWARE Foundation
Sea Life Centre
National Maritime Aquarium
Marine Conservation Society
Oceans Science Teachers Resource Centre
Marine Education Society of Australia
Oceans Conservancy
Secrets@Sea
Ocean Quest

UNEP administered Regional Seas Conventions

Regional Seas Conventions: Mediterranean Action Plan
Regional Seas Conventions: Abidjan Convention
Regional Seas Conventions: East Asian Seas Action Plan
Cartagena Convention
Nairobi Convention

Source: www.unep.org