They jumped head-first into the water at the bottom of a waterfall according to eyewitnesses.
And although they then surfaced again, a strong current prevented them from swimming back to the bank.
Police say a 26-year-old was pulled unconscious from the water by his girlfriend and a passer-by, but he could not be revived.
A search was continuing on Sunday to find his 28-year-old friend who jumped with him into the water. He is expected to have also drowned.