Siegenthaler-Kaestner Esker State Nature Preserve

Siegenthaler-Kaestner Esker is a 37 acre 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.