The river was very wide, and was walled with solid timber on both sides; you couldn't see a break in it hardly ever, or a light.

We talked about Cairo, and wondered whether we would know it when we got to it.

I said likely we wouldn't, because I had heard say there warn't but about a dozen houses there, and if they didn't happen to have them lit up, how was we going to know we was passing a town?
Jim said if the two big rivers joined together there, that would show.

But I said maybe we might think we was passing the foot of an island and coming into the same old river again.

That disturbed Jim--and me too.