Long is situated on the D32 and the D112 crossroads, some 10 miles (16 km) southeast of Abbeville in a part of the valley of the Somme that is filled by lakes and ponds.

During the 19th century, as the population of the town had grown to 1800 people, another church had to be built, though the bell-tower of the original was incorporated within the new building, which was completed in 1851.

Inaugurated three years later on 7 June 1903, the three turbines provided electricity at 120 volts DC for the entire village, at little charge.

The 18th-century château, in pink brick and white stone, with a mansard roof, was built on the site of an earlier medieval castle.

During the Second World War, the building was badly damaged by occupying troops, who burnt doors, windows and flooring.