Pistacia lentiscus (also Mastic; Greek: μαστίχα mastíkha ) is a shrub or small tree of the Pistacio genus. They grow in the Mediterranean Sea region, mainly on the Greek island of Chios in the Aegean Sea. The resin of the tree is called: "mastic". It was famous in the southern region of the island of Chios, called Mastichochoria. The tree is used for food, medicine and industrial purposes.