Mount Meru is the best for the acclimatization prior to Mt.  Kilimanjaro climbing; The Mountain is the Third highest peak  in Africa and the Second highest mountain in Tanzania at 4,568m.

The mountain is located within Arusha National Park, Tanzania’s gem. This prime location gives trekkers the chance to spot some of wildlife that inhabits the area. The ascent is quite steep, the route to the summit passes over streams, through parkland, montane forest, a giant heather zone and moorland. The summit is reached by a narrow, barren ridge, which provides stunning views of the Ash Cone lying several thousand feet below in the crater.

Mount Meru is a volcano which rises just 44 miles west of Kilimanjaro. Though comparatively small, Meru is equally spectacular, with slopes that rise up at incredibly steep angles. It is partially shattered, as its east face was blasted away during an eruption at some point in its past. Though Meru’s summit is rocky and barren, its slopes are highly fertile, with many streams and thick forests. Located in Arusha National Park, Meru and its surrounding terrain is home to a large population of animals, including elephants and lions

Mount Meru is a dormant stratovolcano located 70 kilometres (43 mi) west of Kilimanjaro in southeast Arusha Region, Tanzania. At a height of 4,562.13 metres (14,968 ft),^[1][4] it is visible from Mount Kilimanjaro on a clear day,^[5] and is the fifth-highest of the highest mountain peaks of 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. Mount Meru is also the highest mountain/point in Arusha Region. The Momella route – which starts at Momella gate, on the eastern side of the mountain – is used to climb Mount Meru.^[6]

Mount Meru’s lavas are alkaline in character and include nephelinite.^[7] Much of the mountain’s height was lost about 7,800 years ago due to a summit collapse.^[8] Mount Meru most recently had a minor eruption in 1910.^[2] The several small cones and craters seen in the vicinity probably reflect numerous episodes of volcanic activity. Mount Meru’s caldera is 2.2 miles (3.5 km) wide.^[9]

Mount Meru is the topographic centerpiece of Arusha National Park. Its fertile slopes rise above the surrounding savanna and support a forest that hosts diverse wildlife, including nearly 400 species of birds, and also monkeys and leopards.