Millions of litres of crude oil are flowing down the southern Iguacu River, endangering drinking water, farm land and animal life along a 230 km (140 mile) stretch.

几百万升的原油顺伊瓜苏河流下，对230公里(140英里)河长以内的饮水、耕地和动物生命造成威胁。

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Mr Cadena was held after going to renew his visa at the federal police station in Foz do Iguacu, on the border with Paraguay.

ECONOMIST: Colombia and its neighbours

It is the broad panoramic aspect and multiple cascades that make Iguacu so notable, and why it was named one of the New Seven Wonders of Nature in 2011.

FORBES: Awesome Nature: Iguacu Falls, South America

She was right: many great waterfalls like Niagara are something to look at in wonder, but Iguacu is so grand it takes days to explore, with visits to both sides of the border required.

FORBES: Awesome Nature: Iguacu Falls, South America