Abbaye du Thoronet is a Cistercian abbey located in the Var department of Provence, France. The abbey was founded in the 12th century and played an important role in the development of Cistercian architecture. The building's simple, austere design reflects the Cistercians' philosophy of simplicity and rejection of excess.

The abbey was founded in 1146 by Cistercian monks from the Abbey of Mazan in the Vaucluse region. The monks chose a remote location in the wilderness, where they could live a life of solitude and contemplation. The abbey quickly became one of the most important Cistercian centers in Provence, with a large number of monks and extensive landholdings.

The abbey's architecture is characterized by its simplicity and purity of form. The church, which is the centerpiece of the complex, has a simple rectangular plan with no transept. The nave is covered by a wooden barrel vault, which is supported by massive stone pillars. The walls are unadorned, except for a few small windows that let in a soft, diffuse light.

The abbey's cloister is one of its most striking features. It is a perfect square with a garden in the center, surrounded by a covered walkway with pointed arches. The cloister is a place of tranquility and contemplation, where the monks could meditate and pray in solitude.

After the French Revolution, the abbey was abandoned and fell into disrepair. It was rediscovered in the early 20th century by the French writer, Prosper Mérimée, who recognized its architectural importance. The abbey was restored in the mid-20th century and is now open to the public as a historical monument.

Today, Abbaye du Thoronet is considered one of the finest examples of Cistercian architecture in France. Its austere beauty and simple, elegant lines continue to inspire architects and visitors alike.