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The Ica or Putumayo River is one of the tributaries of the Amazon river, west of and parallel to the Yapura.

In the late 19th century, the Ica was navigated by the French explorer Jules Crevaux (1847-1882). 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. Creveaux discovered the river sediments to be free of rock to the base of the Andes; the river banks were of argillaceous earth and the bottom of fine sand.