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Oceans dominate the planet’s surface, covering roughly 71% of Earth’s area. Although the entire expanse is technically a single global ocean, we have historically divided it into distinct regions for geological, political, and navigational purposes.
Today we recognize five major oceans: the Pacific, Atlantic, Indian, Arctic, and Antarctic (also called the Southern Ocean). The Antarctic Ocean received its official status from the International Hydrographic Organization in 2000.
Now, a sixth ocean is already taking shape—not merely a cartographic update, but a genuine geological transformation driven by tectonic forces.
At the heart of this change lies the Afar Triangle on the Somali peninsula, where the Nubian, Somali, and Arabian plates converge. Over millions of years, these plates have been pulling apart, a process that will eventually split the African continent in two. As the landmass widens, the Red Sea and Gulf of Aden will expand, eventually flooding the space between the plates and forming a new oceanic basin.
Evidence of this nascent ocean appears along the fault lines of the East African Rift System (EARS), which stretches from the Red Sea to Mozambique. The rift has already created the Great Rift Valley and a series of rift lakes, including Lake Nyasa and Lake Tanganyika—tallest and second‑deepest freshwater lakes worldwide. These lakes are widening as the plates drift apart, hinting at the future sea that will replace them.
Perhaps the most striking sign of an emerging ocean occurred in 2005, when the Dabbahu volcano in the Afar region erupted, producing a 35‑mile‑long fissure in the Ethiopian desert. This event exposed a divergent boundary where tectonic plates are pulling apart, mirroring the processes that once split Pangea 200 million years ago to create the Atlantic and Indian Oceans.
Geologists estimate that the full transformation will take five to ten million years, but the first steps of ocean formation are already underway.
