Terrain: interior mostly steep, rugged mountains and dissected, upland plains; coastal areas largely plains and rolling hills
AFS
Intercultural Programs
America's Development
Foundation
Amigos
Earth
Train
Florida
Association for Volunteer Action in the Caribbean and the Americas
Global Brigades
Global Humanitarian Adventures
Global Vision International
(GVI)
Global Volunteer
Network
Habitat
for Humanity
Help Exchange
Involvement
Volunteers Association Inc.
KIDS Worldwide
Medo
Volunteers
responsibletravel
South America
Inside
Sustainable
Harvest International
Volunteer
Abroad
Volunteers for Peace
World Vets
World Wide Opportunities
on Organic Farms