Al-Wahbah crater

Al Wahbah Crater, also Maqlaʿ Ṭamiyyah, is a volcanic crater, which is about 250 kilometres away from Ta'if, on the western edge of the Harrat Kishb basalt plateau in the Hejazi region of Saudi Arabia. The Harrat Kishb plateau contains many volcanic cones. It is 250 m deep and 2 km in diameter. The bottom of the crater is covered with white sodium phosphate crystals.

Source: Wikipedia