Iruppu [or Irpu or Lakshmana Teertha] Falls of the Lakshmana Teertha River lies on the Karnataka side of Brahmagiri.

According to legend, when Lord Rama and Lakshmana were searching for Sita, they became thirsty. Lakshmana shot an arrow into the Brahmagiri from which the river sprang. Lord Rama is said to have dedicated a Shiva Kshethra known as Rajeshwara Temple on the banks of river Lakshmana Teertha. The Lakshmana Teertha river eventually flows into the Kaveri River.