The Guilak (in Persian: Gilak) are an Iranian ethnic group whose homeland is the Gilan Province. They are also found in the neighboring province of Mazandaran. Along with the Mazandarani people, the Guilak form one of the Caspian Sea peoples. They speak the Gileki language, closely related to Mazandarani. Persian (Local names: فارسی Fârsi or پارسی Pârsi)* is an Indo-European language spoken in Iran, Afghanistan and Tajikistan as well as by minorities in Uzbekistan, Turkmenistan, India, Pakistan, Azerbaijan, Georgia, Southern Russia, neighboring countries, and elsewhere. ... Gilan (Persian: گیلان, locally known as Guilan) is one of the 30 provinces of Iran, known during ancient times as part of Hyrcania, with a population of approximately 2 million and an area of 14,700 sq. ... Mazandaran (Persian: مازندران) is a province in northern Iran, bordering the Caspian (Mazandaran) Sea in the north. ... The Mazandarani people (or Tabari people) are a group of Northwestern Iranian people who mostly speak Mazandarani and inhabit Mazandaran. ... The Caspian Sea is the largest lake on Earth by area[2], with a surface area of 371,000 square kilometers (143,244 sq mi) and a volume of 78,200 cubic kilometers (18,761 cu mi). ... Gileki or Giliki (Gilaki in Persian) is a northwestern Iranian language and is spoken in Irans Gilan province. ... Mazandarani or Tabari (Also known as: Mazenik, Tabersi) is an Iranian language of the northwestern branch. ...