A British explorer has discovered the source of an uncharted Amazon river - while being stalked by jaguars and ravaged by insects.br br Daring Ash Dykes beamed with joy after finding the start of the Coppename River in Suriname with fellow adventurers Jacob Hudson, Dick Lock and Matt Wallacebr br The fearless group then bagged a world record the next day by becoming the fastest group to ascend the South American country's tallest mountain, Julianatop.br br They also named two undocumented waterfalls - 'Dykes Falls' and 'Wallace Falls' - after the team members who first spotted them in largely unexplored jungle.