people (divers

) from all nationalities, but-
One can get a "visa" that is valid for two weeks in *Sinai* only. And not everywhere in Sinai- only from Taba to Sharm El Sheikh.
With this visitor's visa you cannot go south of Sharm, west of Santa Catherina. One can go, however, on boat to Tiran (but *not* to Ras Mohammed).
Another type of visa is a regular "tourist visa" that usually allows to stay in Egypt for one month and can be extended in Cairo. With this visa one can visit almost everywhere in Egypt (lots of places are restricted to tourists. For example the western oasis desert). I assume that any tourists who comes to Cairo must have this type of visa.
I don't know if only Israelis are required to this- sometimes they add (upon arrival) a small triangular stamp that says in small illegible letters "registration within 7 days". It means that one has to go to a police station within 7 days and they write his name and the hotel where staying. That's all. Again, I am not sure if everyone is required to do this.
And if speaking about visas (and visa "oddities") then the most strange visa I have ever received was in Kenya. I visited there several times and it happened to me twice but after the first time I already knew

:
On the visa stamp itself (received in the airport upon arrival) it was written "valid for three months". The immigration clerk stamps the visa and writes down just below it (with a really illegible hand-write): "v. for 4w". That's all. So, here's a tough quiz: for how long was the visa valid? Three months? Wrong! "v. for 4w" stand for "Valid for Four weeks". How did I discover it? By chance. After three months ( a few days before my visa "expired") I went to the immigration office in order to extend it for another three months. They were really angry at me because the "4w" in hand writing meant "four weeks". Didn't you know? They shouted at me and insulted me ("You stupid tourist, why don't you ask what the "4w" on the visa means?" etc.). OK, so after cooling them off a little and offering a special fine of 10$ to both officers I was granted an extneded visa.