The Customs department has seized more than 250 kg of hashish washed up on seven beaches in Maharashtra`s Ratnagiri district in six days, an official said on Monday.

The contraband was seized between August 14 and August 19 from Karde, Ladghar, Kelshi, Kolthare, Murud, Burondi and Borya beaches and Dabhol creek in the district, the official said.