All of the other natural rivers flow into the lake.

"No one can find a natural river here," Latz says.

I don't know the exact pattern, but I'm sure now that it involves the disruption of the natural river.

This is the only natural river that flows out from the lake.

Cheremis workers set logs to the bottom of natural river.

The river is too different from the natural, historic river to ever return to its original state.

Only over the last few years the Isar was partly turned back from a canal into a more natural river.

The island's location offers an ideal defensive position at a natural river crossing.

You could tell it wasn't a natural river by how straight it ran, a perfect line in both directions.

In 2004, it was restored from a concrete canal to a more natural river.