The spacecraft that is taking pictures of Mars has recently offered us the image of an old local channel. The river is located in a sickle four kilometers wide. The following image is the most powerful explanation that would show that water flows freely on this planet.
In any case, for the moment there are no remnants of the tributaries of this river, and if the water of the river is filled with rainwater, it would not be surprising to find this type of tributaries.
However, the researcher responsible for the spacecraft's camera, Michael Malin, has affirmed that the spacecraft has not yet been placed in the best position to take the most suitable images and hope to have more information in a year.