Sathuragiri Hills or Chathuragiri otherwise known as 'Sundara Mahalingam' is situated 10 km from Watrap (Wathirairuppu) near Srivilliputhur. The name Sathuragiri came from chathur ("four"), Veda (Vedas) and giri ("hill"), where all the four Vedas met and formed the hill. Another meaning is that the whole mountain is in a square (chathuram) shape, hence the name Chathuragiri. Sathuragiri is the abode of God. It is otherwise also called as Mahalingam Hill. This is also called as "Siddargal boomi". 18 Siddhas were said to live here. This is a mysterious hill where it is believed that Siddhars still worship the lord Shiva. Water falls are in Sadhura Giri. The water source is pure and clear. Devotees should not pollute the water source and bathe in the river carefully. Devotees should save the forest. It is better to avoid plastic covers and water bottles in Sadhuragiri Forest because so many living beings are there.