Procuenca San Juan
- Project for management of the San Juan River Basin in Costa Rica and Nicaragua.
- http://www.oas.org/sanjuan/

Exploring Solutions Past: The Maya Forest Alliance
- Fundraising for El Pilar Reserve and for other development activities in the area. Lists advisors and completed projects, with overview of their goals of combining traditional and modern scientific approaches to preservation.
- http://www.espmaya.org/

Amigos de El Pilar
- A community group based in Bullet Tree Falls working to preserve the El Pilar Archaeological Reserve. Describes ecotourism and other economic development activities. [English/Spanish]
- http://www.interconnection.org/elpilar/

Siam-SERVIR
- Uses space-based observation and knowledge of local ecosystems to prepare maps and information products relating climate and physical environment. Describes conferences, visualizations, and other resources. [Spanish/English]
- http://servir.nsstc.nasa.gov

Mesoamerican Barrier Reef Systems Project
- Works to protect ecosystem extending from the southern half of the Yucatan Peninsula to the Bay Islands of Honduras. Describes training and government capacity building programs. [English/Spanish]
- http://www.mbrs.org.bz

La Amistad Biosphere Reserve
- Located in south-east Costa Rica and north-west Panama in the Talamanca range, including Pacific and Caribbean slopes and highest mountain in each country. Describes vegetation and conservation efforts.
- http://www.nmnh.si.edu/botany/projects/cpd/ma/ma17.htm

Centres of Plant Diversity
- Description of climate, geology, and wildlife of Central America, with links to more detailed information on key areas.
- http://www.nmnh.si.edu/botany/projects/cpd/ma/macentral.htm

EcoLogic Development Fund
- US organization conserving threatened wildlife and wildlands by advancing community-based development and natural resource management in Mexico and Central America. Includes project descriptions.
- http://www.ecologic.org

PRETOMA - Programa Restauración de Tortugas Marinas
- Protects and conserves the populations of sea turtles that use the marine environment of Costa Rica. Describes environmental issues, action programs, and opportunities to participate. [English/Spanish]
- http://www.tortugamarina.org

BRASS/El Pilar Program
- An interdisciplinary research initiative into the prehistory and ecology of the Belize River Valley. Offers photographs of monuments, maps, field reports, publications, and contact details.
- http://marc.ucsb.edu/elpilar/

Central American Ecology and Environment (CAEE/ACEA)
- Current news, mailing lists, and distribution of geographical and remote sensing data for the region.
- http://www.garrobo.org/

Carr's Web
- Researcher's website provides descriptions, photos, and data on Central America's volcanoes.
- http://www-rci.rutgers.edu/~carr/index.html

Volcanic Hazards -- Northern Central America
- Information about the principal volcanoes of El Salvador and Guatemala.
- http://www.geo.mtu.edu/volcanoes/hazards.html