the hamza river (portuguese: "rio hamza") is a recent discovery. under the ground in the amazon area is a huge slowly moving waterway. this slowly flowing aquifer in brazil is about long. it is nearly below ground level. its discovery was announced in 2011.&lt;ref name="hamza google/afp"&gt;&lt;/ref&gt; the hamza "river" and the amazon river are a twin-river system flowing at different levels of the earth's crust.