Question: What  is a 17 acre island separating Long Island and Block Island sounds, that has A ground-dwelling coastal beach grass herbivore endemic of the Meadow Vole ?
Sentence (from "United States v. Maine"): Maine is named in the title of the case because it is the northernmost of the thirteen defendant states with coastline on the Atlantic Ocean in a series of cases related to overlapping claims of state and federal jurisdiction over seas and the seafloor.
Relevant evidence: No