can anyone think of other reduplicative place names? I can think of three others.

There's a Bora Bora in the Pacific somewhere, isn't there?

Dum Dum, where the bullets came from, near Kolkata.

Sing Sing where the convicts go.

Kwekwe in Zimbabwe, formerly Que Que; and Xai Xai in Mozambique, formerly Beira I think, and Tete also there.

I think there's a Kukukuku tribe in Papua New Guinea: there's a Malak-Malak language from northern Australia.