Bear Pond Natural Area is owned and conserved by the Upper Valley Land Trust. It has over 900 acres including 95 acres of peat bog and 65 acres of wetlands at the headwaters of the Mascoma River. From US-4 in Canaan take Switch Road 1.4 miles to a left turn into what looks like a driveway. There is a small parking lot at the end of this short road. 
From Jim Block

The 923-acre Bear Pond Natural Area is situated south of the Mascoma State Forest and north of the Canaan Town Forest. These three areas, combined with a private parcel of land in conservation easement comprise nearly 1,500 acres of conserved land. This is all situated within a principal groundwater recharging area for the Mascoma River and thereby significantly contributes to flooding abatement and sustained pure water for the town of Lebanon, which relies on the Mascoma River as its main reservoir.

The Bear Pond Natural Area was preserved through funding from the New Hampshire Land Conservation and Heritage Investment Program, the Sweetwater Trust, and other public and private donors.