Valle de los Ingenios, Valley de los Ingenios or Valley of the Sugar Mills is a series of three interconnected valleys about 12 kilometres (7.5 mi) outside of Trinidad, Cuba. The three valleys, San Luis, Santa Rosa and Meyer, were a centre for sugar production from the late 18th century until the late 19th century. At the peak of the industry in Cuba there were over fifty cane sugar mills in operation in the three valleys with over 30,000 slaves working in the mills and the sugar cane plantations that surrounded them. The entire area covers 270 km (100 sq mi) and includes the sites of over 70 former sugar mills.

• http://en.wikipedia.org/wiki/Valle de los Ingenios