High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Indiana's only true bog is a special geologic feature of this region which preserves a large variety of plants with extraordinary adaptations for survival. See insect eating plants and tamarack trees; walk on a boardwalk that is placed upon a floating mat of sphagnum moss. Pinhook Bog is about 580 acres, a quarter of which is a floating peat mat. The "moat" surrounds the bog from the uplands. Pinhook Bog is a National Natural Landmark.