How Germany's turning a mining pit into its largest artificial lake

By Willa Rubin,

Emily Kwong, Rachel Carlson, Rebecca Ramirez

Published December 18, 2024 at 8:10 AM EST

Cottbuser Ostsee lake, once the site of a mining pit, is set to be the largest artificial lake in Germany once its completed.

Old mines leave behind a a pressing problem: Huge holes that make the landscape look like a chunk of swiss cheese. But in Germany, some scientists and city planners are turning these holes into lakes.

The largest one will be the biggest artificial lake in Germany when it's done, with a shoreline of 26 kilometers or about 16 miles all around.

But it's not as easy as simply filling the holes with water. It takes a LOT of research to get this science right.

Interested in more environmental stories? Email us at shortwave@npr.org. We'd love to hear from you!

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This episode was produced by Rachel Carlson and edited by showrunner Rebecca Ramirez. Tyler Jones checked the facts. Kwesi Lee was the audio engineer.

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Willa Rubin

Willa Rubin is an associate producer at Planet Money, and she likes telling stories that explore how the economy impacts everyday people. Before joining Planet Money, she helped launch and co-produced Gimlet Media and the Wall Street Journal's podcast "The Journal," a daily news show which has won awards from the New York Press Club and from the Society for Advancing Business Editing and Writing. She previously interned at The Indicator from Planet Money. She has a master's degree in journalism from the Craig Newmark School of Journalism at CUNY and studied politics at Oberlin College. She's a lifelong New Yorker and loves cats.

Emily Kwong

Emily Kwong (she/her) is the reporter for NPR's daily science podcast, Short Wave. The podcast explores new discoveries, everyday mysteries and the science behind the headlines — all in about 10 minutes, Monday through Friday.

See stories by Emily Kwong

Rachel Carlson

Rachel Carlson (she/her) is a production assistant at Short Wave, NPR's science podcast. She gets to do a bit of everything: researching, sourcing, writing, fact-checking and cutting episodes.

Rebecca Ramirez

Rebecca Ramirez (she/her) is the founding producer of NPR's daily science podcast, Short Wave. It's a meditation in how to be a Swiss Army Knife, in that it involves a little of everything — background research, finding and booking sources, interviewing guests, writing, cutting the tape, editing, scoring ... you get the idea.

See stories by Rebecca Ramirez