Cyclone Chido devastated large parts of the archipelago off east Africa over the weekend with winds of more than 200km/h, strewing homes over hillsides and cutting phones, power and drinking water.
In a preliminary report, authorities said at least 21 people had died and more than 1400 were injured, broadcaster France Info reported.
With areas still inaccessible, France's acting Interior Minister Bruno Retailleau said it would take days to ascertain the full extent of damage and deaths as he arrived in the disaster zone.
French President Emmanuel Macron plans to declare a national day of mourning for Mayotte. (EPA PHOTO)
French President Emmanuel Macron announced on Tuesday that he is planning a visit to Mayotte following the devastating cyclone.
Macron, in a post on X, said he intends to make the trip in the coming days "to support our fellow citizens, the officials and emergency services."
Ce soir, à l'occasion de la réunion de la cellule interministérielle de crise, je me suis assuré que l'ensemble des mesures d'urgence pour venir en aide aux habitants de Mayotte soient prises et que la continuité de l'État puisse être assurée.— Emmanuel Macron (@EmmanuelMacron) Je me rendrai à Mayotte…December 16, 2024
Macron also plans to declare a national day of mourning for the French overseas territory.
Cyclone Chido swept over Mayotte on Saturday with storm gusts reaching speeds of over 220km/h, leaving a trail of destruction.
Many impoverished homes were destroyed. Thousands of households are without power, and there are also issues with the water supply and telephone network. Roads are blocked and some areas are cut off.
Residents queued outside grocery stores in search of water and other basics.
"It really is a war landscape. I don't recognise anything any more. There's not even a tree left, the hills, there's not a blade of grass, it's extraordinary," Mayotte resident Camille Cozon Abdourazak told Reuters by video call after her power was restored.
"I found a shop open that had water. There were still a few tins of milk left so I was able to buy a tin of milk for my baby and one for my friend's baby next door," she added.
Teacher Hamada Ali described streets that were covered in mud and trees.
People were sheltering in schools and bottled water was being used for cooking, he said.
"Houses with sheet metal roofs were swept away by the cyclone," he added.
The cyclone's devastation has left roads blocked and some areas cut off across Mayotte. (AP PHOTO)
Communications were down in large parts of the territory, leaving relatives outside desperately enquiring on social media.
"I need an update from Chiconi please, my brother, my sister-in-law and my niece are there and I'm without any news since Saturday," said one.
Acting health minister Genevieve Darrieussecq said Mamoudzou's main hospital was maintaining operations after floodwaters damaged surgical and intensive care units while a field clinic would be set up and 100 additional medics deployed.
More than three-quarters of Mayotte's 321,000 people live in relative poverty.
It has been grappling with unrest in recent years, with many residents angry at undocumented immigration and inflation.
The territory has become a stronghold for the populist conservative National Rally, with 60 per cent voting for Marine Le Pen in the 2022 presidential election run-off.
The prefect of Mayotte, Francois-Xavier Bieuville, said at the weekend that deaths would definitely be in the hundreds and possibly several thousand.
Maritime and aerial operations were underway to transport relief supplies and equipment, including from Reunion Island, another French overseas territory, French authorities said.
with DPA
