Why there no bridges over the Amazon River?

This is factually incorrect. While it's true that there are fewer bridges over the Amazon river compared to other similar sized rivers due to various physical and environmental factors, there are in fact several bridges that traverse the Amazon River in both Brazil and Peru. Some notable examples include the Rio Negro Bridge and the Ponte dos Tupinambas in Brazil, as well as the Iquitos Bridge over Nanay River, a tributary of the Amazon.