Qualla: Lukanga Swamp

Lukanga Swamp: Introduction

Thu, 23 Apr 2026 00:00:00 GMT

Photo credit DBrianWilson, CC BY 3.0. From orbit it looks almost suspiciously round. A dark disc of wetland roughly 40 to 50 kilometres across, ringed by dryland and threaded with the slow, glinting lines of rivers, sitting just west of Kabwe in central Zambia. For a while some researchers wondered whether Lukanga Swamp was an astrobleme, the scar of a meteorite impact. Fieldwork in 2002 found no shocked rocks to support that idea. The truth is stranger: no one knows exactly why it is here, or how it formed. What is certain is that it is alive, and that papyrus covers most of it.

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Image: DBrianWilson | CC BY 3.0

Lukanga Swamp: An Inland Sea of Papyrus

Thu, 23 Apr 2026 00:00:00 GMT

Photo credit Rexparry_sydney, CC BY 2.5. The permanently swampy core of Lukanga covers roughly 1,850 square kilometres. Add in the river mouths that feed it, particularly the Lukanga River arriving from the northeast, and another 250 square kilometres of flooded channels. Throw in the Kafue River floodplains along its w...

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Image: Rexparry_sydney | CC BY 2.5

Lukanga Swamp: The Fish Come and Go

Thu, 23 Apr 2026 00:00:00 GMT

Photo credit Hans Hillewaert, CC BY-SA 3.0. Fishing is the livelihood here, and it fluctuates with the rains. Older estimates put catches in the thousands of tonnes; a more recent report records about 1,200 tonnes, with declining totals blamed on over-fishing. That pattern repeats across African wetlands: a resource that o...

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Image: Hans Hillewaert | CC BY-SA 3.0

Lukanga Swamp: The Shape That Raised Questions

Thu, 23 Apr 2026 00:00:00 GMT

Photo credit Collins Musonda, CC BY-SA 4.0. The circular geometry is what drew impact researchers in the first place. Round wetlands in the middle of continents are rare, and a meteorite crater would explain the shape neatly. But a crater has a signature: shocked quartz, shatter cones, specific mineral transformations in t...

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Image: Collins Musonda | CC BY-SA 4.0

Lukanga Swamp: A Ramsar Site on the Flyway

Thu, 23 Apr 2026 00:00:00 GMT

Photo credit Geoff Gallice, CC BY 2.0. Lukanga is listed under the Ramsar Convention, the international treaty protecting wetlands of global significance. It is also an Important Bird Area. Wattled cranes, pelicans, African fish eagles and countless waterfowl use the lagoons and papyrus beds as breeding, feeding, and ...

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Image: Geoff Gallice | CC BY 2.0