Torrential rain since Saturday has triggered serious flooding across Central Java, with thousands of homes inundated, said disaster agency spokesman Sutopo Purwo Nugroho.
"Initial data... shows the impact of the floods and landslides in Central Java has caused 24 deaths, with 26 others still missing," Mr Sutopo said in a statement.
Footage aired by local broadcasters showed villagers sitting on their roofs to escape the rising water, their cars and homes submerged in brown water.
