I have a few contentious ones and wasn't sure what to do with them.
Firstly in the cities over 3000 years old, whatever may happen to them.
Sulamain-Too – It is in the city of
Osh which celebrated its 3000th birthday in 2000. The WHS includes some parts of the outskirts of the city, whether they are over 3000 years old I don't know. The inscribed area includes Stone Age and Bronze Age sites.
Here is a little more evidence for the 3000th anniversary to supplement the statement on Wikipedia
I can't remember if we ever got to the bottom of the
river banks question.
If we are using the general course of the river instead of things not being directly on them then I have two more to propose.
Guadaquivir River: Cordoba,
Doñana National Park and
Seville (The three inscribed sites are all roughly 400 meters from the river, however the river is an integral part of the location of the city). Also Cerro de la Caldera and Morciguilla de la Cepera which are part of the Rock Art of the Iberian Peninsula inscription sit on the banks of the Rio Guadalen which is a tributary of the Guadalquivir.
River Gambia: Niokolo-Koba National Park, James Island and associated sites. The two Gambian groups of
Stone Circles are on the course of (the advisory body report refers to them being on the banks of) the River Gambia however the closest it actually gets is about 1.5km from the site at
Wassu. Here the link is more cultural as the sites were built along the fertile surrounds of the river, however the river now flows a little distance away from the inscribed areas.