What is the hottest desert in sahara?

The hottest desert in the Sahara is the Dallol Depression in Ethiopia.

While the Sahara itself is known for its high temperatures, the Dallol Depression holds the record for the highest average annual temperature in the world at 34.4°C (93.9°F). It's a volcanic area with extreme temperatures due to its low elevation and intense solar radiation.

It's important to note that while Dallol has the highest average annual temperature, the highest recorded temperature in the Sahara was measured in Azizia, Libya at 58°C (136°F).