Syntheri Rock is a huge, massive limestone rock formed due to volcanic eruptions some million years ago. It is named after an English lady called Ms. Cinthera who is believed to have discovered this place in the 20th century. River Kaneri passes along the side of this rock. Owing to the flow of the river from the vicinity, erosion has resulted in the rocks getting hollowed. The corners of this rock cave are inhabited by numerous pigeons and honeybees.