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interesting cartographic anomaly.
Marble Hill's borders are defined by the course of the original Harlem River, which was also the northernmost end of Manhattan. In the 19th century, the Harlem River Ship Canal was constructed, but Marble Hill is still legally part of Manhattan. Marble Hill, including the MNR station, is still south of the original Harlem River (now buried), despite being on the north shore of the Harlem River Ship Canal. So that makes it as in the borders of Manhattan, legally, despite not being on the island of Manhattan.