At least 142 people were killed in Somalia in the deadly Indian Ocean sea surge last Sunday, officials say.
Somalia's north-east Puntland coastline was the worst hit
The country's transitional government is reported to have set up a special commission to co-ordinate relief.
The UN says it has begun distributing emergency supplies to hundreds of families affected by the tsunami.
It previously warned that Somali victims of the devastating tsunami are in danger of being forgotten by the international community.
Most of the casualties were reported to be from the Puntland region in north-east Somalia.
Around 50,000 people have been displaced, Somali Prime Minister Ali Mohammed Ghedi said on Thursday.
"The damage was felt all along the southern part of Somalia," Mr Ghedi, whose government is currently based in Kenya as the capital is considered too dangerous for ministers, told AFP news agency.
Presidential spokesman Yusuf Ismail Baribari said reports of cases of acute diarrhoea raised the risk of an outbreak of cholera, the AFP news agency reported.
UN agencies are expected to make an appeal for assistance once they have completed an aerial assessment of the full scale of the damage along the Somali coastline.
About 12 tons of rice, maize and vegetable oil were delivered to the town of Hafun in Puntland on Thursday.
UN staff say most houses in the town have been destroyed and thousands of people have lost their possessions.
Twelve Hafun residents have been confirmed dead and many more are missing.
Bodies can still be seen floating in the sea, Hafun's governor told aid workers.