Siegenthaler-Kaestner Esker is a 37-acre (150,000 m2) state nature preserve located in Champaign County, Ohio, United States.

It contains an esker, kame, and kettle, all glacial landforms.

It is an example of a sinuous esker, an ancient ice-walled stream channel which flowed through a Wisconsinan glacier 11,000-25,000 years ago.

This article related to a protected area in Ohio is a stub.

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