Nemrut (volcano) of the earliest trade routes. Two eruptions of Nemrut were probably witnessed by people of Urartu, an ancient state located in the eastern Turkey. These eruptions occurred c. 787 BC (period of King Menua) and c. 657 BC (period of King Rusa II), and the latter eruption might cause the sudden disappearance of the city Uaiais located 30 km east of Süphan. In the 1980s, Japanese volcanologists studied the evolution of gases inside the caldera of Nemrut. They found that the ratio of helium isotopes He/He is 1.06, which indicates volcanic activity (most of the measured helium evolved from the
Mount Meru (Tanzania) Mount Meru (Tanzania) Mount Meru is a dormant stratovolcano located west of Mount Kilimanjaro in the country of Tanzania. At a height of , it is visible from Mount Kilimanjaro on a clear day, and is the fifth-highest mountain in Africa, dependent on definition. Mount Meru is located just north of the city of Arusha, in the Arusha Region of Tanzania. It is the second-highest mountain in Tanzania, after Mount Kilimanjaro. The Momella route – which starts at Momella gate, on the eastern side of the mountain – is used to climb Mount Meru. Much of its bulk was lost