According to the United States Census Bureau, River Edge borough had a total area of 1. 895 square miles ( 4. 909 km < sup > 2 </ sup >), of which, 1. 854 square miles ( 4. 802 km < sup > 2 </ sup >) of it is land and 0. 041 square miles ( 0. 107 km < sup > 2 </ sup >) of it ( 2. 18 %) is water.
According to the United States Census Bureau, Riverton borough had a total area of 0. 966 square miles ( 2. 502 km < sup > 2 </ sup >), of which, 0. 665 square miles ( 1. 722 km < sup > 2 </ sup >) of it is land and 0. 301 square miles ( 0. 780 km < sup > 2 </ sup >) of it ( 31. 17 %) is water.
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