Port Isobel, referenced on nautical charts as East Point Marsh, is a 250-acre island east of Tangier Island, Virginia. It is the southernmost point between the Tangier Sound and the Chesapeake Bay proper. In the 1800s, it was inhabited by families from Tangier Island, but rising sea levels in the 1920s forced them to abandon their homes.
The majority of the island was donated to CBF in the late 1980s, when it became one of CBF's five island education centers. With CBF's online Osprey Tracking Map, teachers and students can track the activities of local osprey once they've returned to their classrooms.