The marine lab has walking access to 2.5 miles of coast. Marine habitats include rocky intertidal, cobble beach, soft sediments, and subtidal eelgrass beds (Zostera marina). The benthic habitats of Harpswell Sound are largely sedimentary and shallow (3-5 m water depth). A short boat ride from the BML provides access to a variety of exposed rocky environments typical of the Gulf of Maine, including numerous offshore islands. The estuary of the Kennebec River can be easily reached for day trips.
The terrestrial side of the BML is dominated by coastal spruce-pine and hardwood forest, and includes vernal pools. An old field serves as a grassland habitat, kept in an early successional phase by annual mowing in the late Fall.