People stand together to spell out a message that reads in Portuguese: "Defend the Amazon coral reef", on Copacabana beach in Rio de Janeiro, Brazil, March 29, 2017. The event is a protest organized by the non-governmental environmental group Greenpeace against announced plans to explore for oil in the Amazon River Basin. (AP/Mario Lobao)

Oil Giants Admit Risk Of Spill In Drilling Project Near Amazon Reef

The reef – which is largely undocumented – is believed to be more than a thousand miles long, stretching from the southern tip of French Guiana to Brazil’s Maranhão State.