The Siamese cat is one of the first distinctly recognized breeds of Asian cats. Derived from the Wichianmat landrace, one of several varieties of cats native to Thailand (formerly known as Siam), the original Siamese became one of the most popular breeds in Europe and North America in the 19th century. The carefully refined, more extreme-featured, modern-style Siamese is characterized by blue almond-shaped eyes; a triangular head shape; large ears; an elongated, slender, and muscular body; and various forms of point coloration.

Source: Wikipedia