Ica

The Ica or Putumayo, one of the tributaries of the Amazon river, west of and parallel to the Yapura, was found more agreeable to navigate by [Jules Crevaux]?. He ascended it in a steamer drawing 6 feet of water, and running day and night. He reached Cuemby?, 800 miles above its mouth, without finding a single rapid. Cuemby is only 200 miles from the Pacific Ocean, in a straight line, passing through the town of Pasto? in southern Colombia. There was not a stone to be seen up to the base of the Andes; the river banks were of argillaceous earth and the bottom of fine sand.