As they trudged through the thick growth of the jungle, Phineas noted that Eliza seemed to grow more and more weary. When at last the river's roar could be heard up ahead, he put his hand on her shoulder. It was clear to him that either a strong sense of will and necessity or a hint of pride would not allow Eliza to rest.
"Hold up, it's okay..." Phineas said, stopping and taking several deep breaths. "You'll be useless if you collapse before we get there. Take a rest, we've got time." He set down his rucksack and breathed a sigh, stretching his back and shoulders. "Stay here and rest, I'm going to take a look ahead." 
The patch of foliage the two were hiding in was only a few yards away from the river. Phineas pushed aside several tall ferns and shrubs and made his way to the shore. The river had no sand lining it, but was filled with round stones, smoothed by the current. In actuality, the river was rather shallow, and only a few yards across. Bending down to feel it, Phineas found that the water was ice cold, being mostly runoff from snow on the mountain. He shook his hands dry and shivered, standing back up.