Québec City, one of the oldest and most historic cities in North America, is situated atop a plateau overlooking the St. Lawrence River. One hundred years after its founding, it was the largest settlement in what is now Canada. It is the only walled city in the Americas, the wall which divides it into its two sections, the upper town and lower town. It is the seat of government for the Province of Québec, where, unlike other provincial governments where English is the working language, French or English can be used. Many of the city's landmarks owe their style to the French settlers. The Chateau Frontenac is one such landmark. The city is surrounded by farms as agriculture is still the most important industry in the province. Nearby sites include Montmorency Falls - the hydroelectric dam from which provides the city with much of its electricity - and the Plains of Abraham, where the primary battle between the French and English for control of the country took place.