Feki on Wednesday told parliament that among the bodies found were 36 Tunisians and 267 foreigners.
Tunisia and Algeria are the latest countries struggling with intense wildfires amid soaring temperatures.
Opposition has kept up its demonstrations against what it calls a coup against Tunisias democracy.
As blistering heatwave hits Tunisia, migrants from sub-Saharan African countries are enduring unbearable conditions.
I met this guy, with a baby. I asked: Why are you here with a baby? He said: Either we die here, or in Tunisia.
Power politics in Tunisia in the 1970s and Prime Minister Hedi Nouiras battle to bring prosperity to his country.
El General, whose song inspired Tunisia's pro-democracy revolution, laments the return of repression.
The African Court has given Tunisian authorities 15 days to implement measures and respond to their calls, lawyers said.
The EU offered Tunisia a 105 million euro ($114.5m) package to help it tackle a big rise in migrant departures.
Libyan border guards say about 150 asylum seekers cross into Libya every day after being expelled from Tunisia.