[Edward and Elinor are baiting Margaret, who is playfully hiding]
I, eh, wish to check the position of the Nile. My sister tells me it is in South America.
Oh. No. No, um, she's quite wrong, um, for I believe it is in Belgium.
Belgium. Surely not, I think you must be thinking of the Volga.
[under the table]
Of course, the Volga, which, as you know, starts in...
Vladivostock, and ends in...
Precisely. Where the coffee beans come from.
Ugh! The source of the Nile is in Abyssinia.