Volo Bog started to form from a glacial lake more than 6,000 years ago. It’s still encroaching on the center of the lake, called the “eye” of Volo Bog. Grist thanks its sponsors. Become one.

This is the center of the bog, where for thousands of years, wetland plants like sphagnum and tamarack trees have been slowly encroaching from the edges of the lake left behind by a glacier.