The Horn of Africa includes Somalia, Ethiopia, Eritrea, and what other country?

Djibouti

What color is Ursula’s skin in "The Little Mermaid"? What imaginary creature looks like a horse with a horn? Who does Will Ferrell portray in the 2003 holiday comedy 'Elf'? What chemical substance provides pigment for human skin color? What country celebrates Easter with exploding carts called Scoppio del Carro?