The kind of wildlife around the Rhine is sea life and not many animals.

The above is incorrect, the Rhine is an exceedingly long river and passes through plenty of rich habitats. Examples of most of the wildlife of Europe can be found by, on, and in the river, and it is not until it's lower (tidal) reaches that much in the way of marine wildlife will be found, with the exception of sea birds, which may be found far inland. Salmon have even been recorded returning to the catchment, as much of the heavy industrial pollution has been stopped and cleaned up.

No, the Rhine does not flow through Cairo.

It starts at Switzerland and ends at The Netherlands.

Many industries are located along the Rhine, domestic waste, sewage, phosphates, lead, mercury are released into the river,. Anything from soap to rusting bicycles are thrown into the river. A long term solution to solve the problem has yet to be found

It flows from Switzerland, forming much of the border between France & Germany into the Netherlands where it exits into the North Sea.

The Netherlands (Low-Lands) are North of the Alps. This is where the river starts. The elevation grade from Switzerland to the river's mouth in the Netherlands declines.

The Rhine river flows through Europe, which is part of the Eurasian land mass.

Alsace and Lorraine

There are no capital cities directly on the Rhine river. There used to be Bonn (capital of West Germany), but it lost its capital status when the Berlin wall came down and Germany was united.

There are lots. Here are a sample of the larger ones, from source to mouth:

Chur, Konstanz, Schafhausen, Basel, Mainz, Wiesbaden, Koblenz, Bonn, Köln (Cologne), Düsseldorf, Nijmegen, Rotterdam.

The Rhine river's delta, mouth or end is at the north sea at the following co-ordinates 51°58′52″N 4°5′35″E

The Mosel and the Rhur are just two. Many rivers feed into the Rhine.

That depends. There is no Standard for measuring rivers AFAIK.

"There is not yet full consistency or standardization of scientific terminology used to describe watercourses. A variety of symbols and schemes exist. Parameters based on mathematical formulae or numerical data vary as well, depending on the database used by the theorist."

From here;

http://en.wikipedia.org/wiki/Meander

It isn't as simple as it might seem. Yes, you can use a laser range finder and determine to the cm. how wide the river is where you are measuring, but is that the widest part of the river? What season is it? The Nile is little more then a creek in places during the dry season, but is a major water barrier during the flood season. Many rivers are like that. Plus any major river is subject to tidal flows where it empties into the sea. So what time of the day is a factor also.

Then there is to 'dry' part to consider. Rivers meander. Do you count the old width, or the new one?

I think the defining measurement should be the longest bridge across the river. But that is just my opinion, which means it and 5$US will get you a cup of coffee at Starbucks, if they are still in business when you read this.

820 miles long

Rotterdam is located at the mouth of the River Rhine.

The Latin for "Rhine River" is "Flumen Rhenum."