Portsmouth, New Hampshire 03801
Borthwick Avenue Marsh is a wetland area located on the south side of Borthwick Avenue near Portsmouth Regional Hospital. The marsh is an important ecosystem, providing water purification, flood control, and carbon sequestration. It offers recreational opportunities for visitors, such as birdwatching, hiking, and photography. The marsh is protected by the New Hampshire Department of Environmental Services and the Society for the Protection of New Hampshire Forests.
Last updated October 23, 2023