The marshes(*) of the river Sieg

A bit north of Bonn on the right (i.e. the "wrong") side of the Rhine the river Sieg flows into the Rhine. Between those two there is a narrow promontory - the marshes of the Sieg. Whereas at first there is still some humid pasture, as can be seen on the picture, at the end there are only elders and mighty poplars, under which the Sieg passes through as through a gothic cathedral.

(*) The original word "Aue" means something like "temporarily flooded lowland near a river - mostly with willows, poplars and alders". But I don't know how to translate it.