Ganja, weighing 300 kg, was seized from two different places in the district Monday, police said.
The narcotic, weighing 150 kg, was seized from a house near here and a search was on for three people in this connection, the police said.
A similar quantity of the contraband buried in a casuarina grove at Kodiakkarai was also confiscated, they said.
Investigation was on to find out who had hidden the drug in the grove, they said