According to the United States Census Bureau, the town has a total area of 36.5 square miles (94.5 km2), of which 35.6 square miles (92.2 km2) is land and 0.9 square miles (2.3 km2) is water, comprising 2.39% of the town. Derry is drained by Beaver Brook. The highest point in the town is Warner Hill, at 605 feet (184 m) above sea level, where from the top one can see the Boston skyline on a clear day. Derry lies almost fully within the Merrimack River watershed, with a small section along the northern border of town lying in the Piscataqua River watershed.
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