Mythological Importance of Karighatta
Varaha Purana
Varaha Purana mentions the Neelachala which means Blue Mountain in Sanskrit and also says performing Pooja tot his hill can relive from problems in life.
The Varaha Purana also says that the darbbehullu is derived from the body hairs of Vishnu. The Varahaavatari Vishnu shook his body the hairs fell down and grown as grass. This grass is believed to be very holy and used to perform Poojas. This darbbe is found in karighatta to a greater extent.
Kutsamuni story
In the tetra yuga there exists a great sage called Kutsamuni. Once a wild elephant attacked a girl taking bath in the river and killed them. It is believed that the sage prayed lord Vishnu and bring back there life.
Story of Sugreeva
It is believed that during the period of Ramayana to construction bridge to Sri Lanka to get back Sita from srilankaSugreeva brought “Neelachala”(Blue mountain) from Thirumala (Thirupathi). The devotees of Lord Vishnu requested Sugreeva to place this hill in this place.as per the request of devotees of Vishnu the blue hill was placed near Srirangaptana.
There is also sayings that when Lakshmana got hurt by Meghanada in Ramayana Hanuman carried this hill thinking that this hill has Sanjeevini plant. Later hanuman realized that this hill does not contain the plant he dropped the hills at Srirangapatana.