The Tar ( Tar, in its upper course Alaykuu ) is a river in Kara-Kulja District of Osh Region of Kyrgyzstan. It rises on the north slopes of the Alay Range (Pamir-Alay). At its confluence with the river Kara-Kulja east of Uzgen, the Kara Darya is formed. The section of the Tar upstream from the mouth of the Terek is called Alaykuu. The Tar has a length of 192 km with a basin area of 4420 km2. It is fed predominantly by snow and ice meltwater and springs. The average annual discharge is 45.7 m³/s. The maximum flow is 214 m³/s in June-July and the minimum - 8.9 m³/s in January-February. The river is largely used for irrigation.