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Named for Anthony Oliff, a resident of Montclair, Toney's Brook originates in Montclair northwest of the Upper Montclair railway station. In Montclair it is joined by two tributary streams and continues through Anderson Park, Edgemont Memorial Park, Montclair High School and Glenfield Park.
It then flows into Bloomfield and, in Watsessing Park, joins the Second River, a tributary of the Passaic River. Many roads have been built over the brook and in some places it is covered up completely, canalized or culvertised.