|- location||Arabian Sea, India|
|Length||50 km (31 mi)|
Kolak river flows from Saputara to arebian sea near Udwada (holy place of Parsis in Gujarat). There is a huge textile plant of welspun and alok industries on southern side river bank. It flows from north side of Vapi city in Gujarat.
It is also connected to Madhuban reservoir of damanganga river and it becomes polluted from Morai village of Vapi where it meets with Bhilkhadi river which is having heavy chemical effluents from Chemical industries of Vapi GIDC and textile industries.
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