‘Environmental Literacy’ series … • Guanabara Bay is a tropical (22°S) embayment with a restricted opening which forms a natural harbor in Southeast Brazil with a monsoonal/savanna climate. • The watershed around Guanabara Bay is an internationally iconic location, including metropolitan areas like Rio de Janeiro, Niteroi and Sao Goncalo, beaches like Copacabana and Ipanema, and sights like Sugarloaf and Corcovado.