Djibouti is, in essence, a vast desert wasteland. From the narrow coastal plain, the land rises in the north to a small series of mountains.
Central and south Djibouti is covered by a stony desert and scattered volcanic plateaus crisscrossed by deep, time-worn troughs, some with shallow salt water lakes.
The highest point, Moussa Ali at 6,768 ft (2,063 m), is a stratovolcano whose last eruption was over 12,000 years ago; the lowest point of the country is Lake Assal at -508 ft (-155 m).
Lake Assal, also the lowest point of Africa, is located in central-eastern Djibouti, and is a crater lake whose salinity levels are 10x that of the sea. Lake Assal is the one of the most saline bodies of water, after Don Juan Pond, and is the world's largest salt reserve.
There are no significant rivers in Djibouti.