...Two men are loading a small white, red and blue boat on the Bolivian bank of the river.

About 50m away, on the Peruvian side, Cecilio Flores is anxiously waiting to load his precarious tricycle with the 20-litre barrels being hauled aboard.


Mr Flores transports up to 10 loads of subsidised Bolivian diesel oil each day.

"I can make about one [Peruvian] sol per litre. If you multiply that by the 200 litres I am about to get, I make about 200 soles (£34; $70) per load," he told the BBC.