The Tar ( Tar, in its upper course Alaykuu ) is a river in the Kara-Kulja District of the Osh Region of Kyrgyzstan. It originates on the northern slopes of the Alay Range (Pamir-Alay) and on the southwestern slopes of the Fergana Range. At its confluence with the river Kara-Kulja, east of Uzgen, it forms the Kara Darya. The section of the Tar upstream from the mouth of the Terek river is known as Alaykuu.
The Tar is long and drains a basin of .
In its middle course, the river flows through small valleys and deep (1âÂÂ2 km) narrow gorges; in the lower course, it flows through the Alaykuu Valley.
The riverâÂÂs average annual discharge is , with peak flows of up to in June-July and a minimum discharge of about in January-February. It is fed mainly by snowmelt, glacial meltwater, and springs. The flow begins to rise in April and decreases in October. The Tar is an important source of irrigation water in the region.