Mars Location The presence of meandering channels, a cut-off meander, and criss-crossing channels in the Eberswalde Delta provided the first clear evidence that some valleys on Mars experienced persistent flowing liquid over a long time period, much like rivers on Earth. (Mars Global Surveyor, Mars Orbiter Camera image; NASA/JPL/Malin Space Science Systems)
Earth Analog Just before it empties into the Laptev Sea in northern Siberia, the Lena River splits into several small rivers that flow into a flat plain to create the Lena River Delta. At 4,400 km (2,800 miles) long, the Lena River is one of the largest rivers in the world. (Landsat 7 Enhanced Thematic Mapper Plus image; U.S. Geological.