The Danakil Depression is the hottest place on Earth in terms of year-round average temperatures. It is also one of the lowest places on the planet at 100 metres (330 ft) below sea level. The Dankil Depresssion is a plain approximately 200 by 50 km (124 by 31 mi), lying in the north of the Afar Region of Ethiopia, near the border with Eritrea. It is about 125 m (410 ft) below sea level and is bordered to the west by the Ethiopian Plateau and to the east by the Danakil Alps, beyond which is the Red Sea. Numerous sulfur springs, volcanoes, geysers, acidic pools, vast salt pans, and colorful mineral-laden lakes dot the area, which formed above the divergence of three tectonic plates. Volcanic activity heats spring water, bringing sulfur and iron to the surface, leaving behind yellow, green, and orange deposits. For centuries, locals have been trekking in with camel caravans to mine the salt by hand, and in recent years, a few have been guiding tourists into the alien-looking landscape.