Mendon Ponds contains a number of unique glacially created land structures, including a kettle hole known as the "Devil's Bathtub", eskers, a floating sphagnum moss peat bog, and kames.

At the northernwestern end of the line of other glacial ponds and lakes near the "Devil's Bathtub", there is a sphagnum moss peat bog, where the build-up of moss has created a floating island in the middle of the lake.
 Due to the acidity buildup and lack of decay caused by the sphagnum moss, the bog is home to a number of carnivorous plants, including sundew and pitcher plants.
Mendon Ponds contains a number of unique glacially created land structures, including a kettle hole known as the "Devil's Bathtub", eskers, a floating sphagnum moss peat bog, and kames.
At the northernwestern end of the line of other glacial ponds and lakes near the "Devil's Bathtub", there is a sphagnum moss peat bog, where the build-up of moss has created a floating island in the middle of the lake.  Due to the acidity buildup and lack of decay caused by the sphagnum moss, the bog is home to a number of carnivorous plants, including sundew and pitcher plants.
Mendon Ponds Park