Heavy rain has flooded sections of either side of the Angola-Nambia border, forcing thousands to leave their homes.
The BBC reports the Angolan Red Cross as saying about 25,000 people have lost their homes in the southern Angolan province of Cunene.
Homes and livestock have been swept away and many people have been cut off as flood water covered roads and fields.
Six regions in northern Namibia are flooded, and newspaper reports suggest that the situation is worse than last year, when 65,000 people were affected.
There has been more rain since December than during the whole five months of the rainy season of 2007-2008.
More heavy downpours are forecast for the coming days.