Something strange has been building up at Chia Lagoon in Malawi, and it isn’t just an eyesore. Chia Lagoon weeds, A thick, tangled mat of floating weeds has crept across the water, and now farmers can’t get their fields to drain, and fishers can’t get their boats out. For the families who live off this lagoon, that’s not a small headache. That’s their next meal and their next paycheck sitting under water they can’t move.
What Is Actually Going Wrong at the Lagoon
Chia Lagoon sits along Lake Malawi’s western shore, in Nkhotakota district, and it usually drains out through one narrow channel. Around February, that channel started clogging up with weeds and loose plant matter. Once it clogged, the water had nowhere left to go, so it pushed backward into the lagoon and spilled straight into farmland growing rice, maize, and cassava.
Ali Maulidi, who leads a group representing over 1,000 local fishers, put it plainly: nobody here remembers seeing anything like this. Cassava that was ready to pull from the ground has rotted in soil that’s been sitting under water for weeks. And boat routes people have used for years are now knotted up with weeds.
Two Livelihoods, One Blocked Waterway
The lagoon isn’t huge, about 1,700 hectares, but it carries a lot of weight. Over 7,800 households farm, fish, or hunt birds around it. Zoom out to the wider river network feeding into it, and more than 55,000 people rely on that land for farming. So one blocked channel doesn’t stay a small, local problem. It spreads outward fast.
- Fields stay flooded too long, so planting gets delayed and crops close to harvest just rot
- Boats can’t reach fishing grounds that used to be easy to get to
- Less fish and less harvest means less money coming into the house
- Birds, fish, and other wildlife that depend on the wetland lose ground too
It’s worth noting that just last December, Chia Lagoon earned recognition as a Key Biodiversity Area because of how much bird, fish, reptile, and plant life it supports. Watching it choke up now stings a bit more, knowing that.
What Might Be Driving the Buildup
Nobody has a full answer yet, but researchers studying the watershed have some theories. Years of tree cutting, farms spreading out, and new settlements pressing in have worn down the land around the lagoon. Some farmers have gone even further and started planting inside what should be untouched wetland.
Ecologist Tiwonge Mzumara-Gawa, who’s been researching land use in the area, thinks loose soil washing in from that encroachment is part of the story. She also brings up two flooding events, one in December 2025 and another in January 2026. Her theory is that water rushing down from the degraded highlands came through harder and faster than usual, ripping plants out and dragging huge clumps of vegetation into the lagoon in one go.
Conclusion
What’s happening at Nkhotakota’s Chia Lagoon is a hard reminder that a wetland’s health depends on everything happening around it, not just in it. Protecting the land buffering the lagoon and reining in encroachment won’t undo the damage overnight, but it could stop the next blockage before it starts, and that matters for the thousands of families whose farms and boats depend on this water.
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