[NASA] A Glimpse of History in Benin City

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3. A Glimpse of History in Benin…

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January 11, 2025

In some ways, Benin City is like dozens of other fast-growing cities in Nigeria. Buoyed by burgeoning industrial and agricultural sectors, the city’s population rose by

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over the past four decades as its footprint on the West African landscape expanded

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.

Amid bustling new networks of roads, residential neighborhoods, markets, and workshops, lie signs of a much earlier era, when the city was the seat of a powerful pre-colonial kingdom. Remnants of ancient earthworks, thought to be among the longest in the world, can even be seen in images of the city captured from space.

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(sometimes called the Benin Earthworks, the Walls of Benin, and the Benin Moat) is a vast, cellular network of interlocking earthen walls, ramparts, and ditches that radiate outward from a central moat at the heart of the city. Built in sections over hundreds of years between the 7th and 14th centuries, the system was key to marking defensive, political, and economic boundaries and played an important role in maintaining order and stability in the

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The

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(Operational Land Imager-2) on

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captured this image of the remains of earthworks on January 11, 2025. The features appear as dark green lines that

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in a densely settled area near the airport on the west bank of the Ikpoba River. Trees and vegetation growing in the moats give the features a dark green color.

Most of the earthworks consisted of relatively narrow and shallow linear ramparts and ditches that spread widely across the landscape. Many sections have been destroyed or are too small or too obscured by modern development to be easily detected by satellites or astronauts in orbit. However, some inner sections that run through the modern Oredo, Egor, and Ikpoba-Okha areas of the city had true walls and moats and are among the most visible in Landsat imagery.

Archaeological research indicates that the earthworks spanned more than 16,000 kilometers (10,000 miles) and enclosed roughly 6,500 square kilometers (2,500 square miles)—an area as large as the U.S. state of Delaware. Such length means the features hold the

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for being the “longest earthworks of the pre-mechanical era.” By some measures, the features were together significantly longer than the

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NASA Earth Observatory image by Lauren Dauphin, using Landsat data from the

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. Story by Adam Voiland.

References & Resources

• Guinness World Records
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  . Accessed November 25, 2025.
• The Met (2025, May 31)
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  . Accessed November 25, 2025.
• MOWAA
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  . Accessed November 25, 2025.
• MOWAA
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  . Accessed November 25, 2025.
• Onwuanyi, N. et al. (2021)
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  African Journal of Environmental Research, 3(1), 21-39.
• Schepers, C. et al. (2025)
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  . African Archaeological Review, 42, 519-537.
• UNESCO (1995)
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  . Accessed November 25, 2025.
• World Monuments Fund (2025)
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  . Accessed November 25, 2025.

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January 11, 2025

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