At a distance of 35 Kms from Araku Valley, Masthyagundam, also called as 'fish pool' is an interesting pool on the Machkund River near the village of Matham (15 kms from Paderu)
A barrier of rocks runs right across the river and the stream plunges into a great hole and vanishes beneath this to reappear again at about 100 yards lower down. Just where it emerges under the barrier, it forms a pool which is crowded with fish of all sizes. Now, steps have been formed and one can straight go up to the pool. These are wonderfully tame and feed fearlessly from one's hand. They even let you pat their backs. Here, the tribal and other people venerate the fish. There is a small Siva temple on the bank of the river.