The hills of the New Germantown Outlier are located along the border of Tewksbury Township and Readington Township, New Jersey, approximately seven miles southwest of the southern extent of the Watchungs and about three miles north of Cushetunk Mountain.
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Union Hill is located near the village of Suffern in Ramapo, New York, about three and a half miles north of the Watchung Mountains, or about halfway between the Ladentown Outlier and Campgaw Mountain.