Najafgarh Lake, Najafgarh Marsh or Najafgarh Jheel, fed by Sahibi River, used to be a vast lake in the south west of Delhi, near the town of Najafgarh, from which it takes its name. It was connected to the river Yamuna by a natural shallow nullah or drain called the Najafgarh nullah. However, after the 1960s the Flood Control Department of Delhi kept widening the Najafgarh drain. The reason provided by the department was saving Delhi from floods. This widening led to the eventually drainage of, the once huge and ecologically rich, Najafgarh lake. Rainwater accumulating in the Najafgarh lake or jheel basin had been recorded to have occupied more than 300 square kilometres (120 sq mi) in many years before its draining.