Lydick Bog, a dedicated Indiana state nature preserve located in South Bend, protects one of the last remaining sphagnum bog habitats in Indiana. Many interesting plant species characteristic of bogs have been identified, including winterberry, tamarack, large cranberry and carnivorous species like round-leaved sundew and pitcher plant. Other wetland types here include marsh, a large riparian corridor, and several kettle hole wetlands – glacier-carved depressions that collect water from the surrounding hills.

The wooded areas are dotted with glacial rocks and feature maple-and-oak forest and savannas dominated by oaks and hickories. Spring and summer offer an ever-changing wildflower display. The preserve is a haven for amphibians and reptiles, and it attracts a wide variety of birdlife.