“Menemsha”

Martha's Vineyard's ponds explained: the great ponds sealed behind the south-shore beach and cut open to the sea by hand, the salt ponds with tides and scallops, the freshwater kettle ponds, why cyanobacteria blooms turn some of them green in August and what MV Cyano's colors mean, the nitrogen under the houses, and where a visitor can swim, paddle and watch the cut.