All of the rivers in which Strel has swum are difficult, but the Amazon was the most challenging.
Its length, amount of water, difficult currents, extreme tides, and dangerous creatures required a large support team and a lot of equipment.
A group of doctors and guides traveled with Strel.
Strel swam through deadly marine life, feeling the occasional touch of a large unknown creature.
He never looked in the water to see what it was.
He just kept swimming, determined to reach his goal.