Jambunatha form of Shiva is worshipped mainly South India,
especially in Karnataka. This form is associated with Jambu tree. Legend has it that Shiva gave darshan to an
ardent devotee of His under the Jambu Tree.
A sage was once performing Tapas under a Jambu Tree. He got
a fruit from the tree. He offered it to Shiva and later consumed it as Prasad.
The fruit germinated in the stomach of the Sage and grew up into a tree.
Shiva
appeared on the tree and gave darshan to the sage by appearing on the tree.
As Shiva appeared under a Jambu tree, he came to be known as
Jambunatha.
The most famous temple dedicated to Jambunatha is located at
Thiruvanaikovil in Tamil Nadu and is known as Jambukeswarar Akilandeswari
Temple.