Authorities last week confirmed 70 deaths after landslides hit three Gamo Zone districts - the Gacho Baba District, Kamba District and Bonke District - following a week of heavy rain.
More than 11,000 people have been displaced, the regional government's communications office said in a statement.
Prime Minister Abiy Ahmed visited the scene of the landslides over the weekend to condole with local residents and pledged government support, according to a post on his X account.
The Government Communication Service said the government is mobilising resources in co-ordination with regional authorities.
Donations from private citizens and business organisations are flowing into a fund announced by the regional government to provide relief items to those affected.
Heavy rains have pounded countries in East Africa, and in neighbouring Kenya the death toll from Saturday's flash floods rose to 62.
The region is expected to see more rain given the rainy season and governments have urged residents to exercise caution.
Last month, the IGAD Climate Prediction and Applications Centre said the March–April–May rainy season has a 45 per cent chance of above-average rainfall across most countries in the region, including Uganda, Rwanda, Burundi, Tanzania, Kenya, Ethiopia, South Sudan, Northern Somalia, and Djibouti.
with AP
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