Ward Reservation in Andover is a place to discover the unique geology of the Merrimack Valley. Comprised of three major hills – Holt, Shrub and Boston – the property contains more than 700 acres for hiking and exploring. Holt Hill – the highest point in Essex County – is a glacial drumlin. At the foot of the hill is a rare quaking bog named Pine Hole Pond. Both of these geological features are illustrated in this 1830 town plan. Nearby Weir Hill, identified here as “Wire Hill,” is a scenic landscape situated on Lake Cochichewick with miles of hiking trails among unique habitat types and rare plant species.