How long did it take for the 2004 Indian Ocean tsunami to reach the Horn of Africa?

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Aceh, Indonesia: tsunami aftermath — tsunami Aftermath of the December 2004 tsunami in Aceh, Indonesia.

The 2004 Indian Ocean tsunami reached the Horn of Africa within seven hours of the initial earthquake.1

Triggered by a magnitude 9.1 earthquake off the coast of Sumatra on December 26, 2004, the waves traveled more than 3,000 km (1,800 miles) across the Indian Ocean to strike the East African coastline.21