Doctors Without Borders (MSF) says several remote communities on the outskirts of Mozambique, Malawi and Zimbabwe have not yet been assessed following the damage of tropical cyclone Idai.
MSF has deployed several emergency teams on the ground in Mozambique, which was the hardest hit by the cyclone.
The organisation's Jens Pedersen says because some outlying areas are not accessible, rescuers and aid groups have not been able to quantify the extent of damage.
Pedersen explains that without assessments humanitarian groups struggle determining how much relief is needed in terms of medical care, water and food supplies and shelter.
We are still finding it difficult to reach flooded areas, in particular in more peripheral areas.— Jens Pedersen, Senior humanitarian policy advisor - Doctors Without Borders
Over the past three days, we're sending almost 50 tonnes of emergency supplies from across the world to the affected areas.— Jens Pedersen, Senior humanitarian policy advisor - Doctors Without Borders
Listen to the update on The John Maytham Show: