Lake Urmia is an endorheic salt lake in Iranian Azerbaijan, Iran and near Iran's border with Turkey. The lake is between the provinces of East Azerbaijan and West Azerbaijan in Iran, and west of the southern portion of the Caspian Sea. Over the past few decades, Iran’s salty Lake Urmia has shrunk rapidly and become even saltier. In addition to its disappearing act, the lake has also been undergoing spectacular color changes in the warmer seasons due to microscopic organisms