The Empakaai Crater or Embagai (Kasoko la Empakai in Swahili, also Ela Nairobi) is a collapsed volcanic caldera located in Naiyobi ward of Ngorongoro District in Arusha Region of Tanzania.

The crater is a caldera and is within UNESCO Biosphere Reserve protection program[3] Empakaai's elevation on the outside is 3,200 m above sea level on the western side and 2,590 m above sea level on the eastern side.

Empakaai is nearly always blanketed in mist due to its high altitude, and the lake appears emerald or deep blue in color.

[4] The rim of the crater offers views of Oldoinyo Lengai, Mount Kilimanjaro, and the Great Rift Valley.

This area is home to the bearded vulture, the augur buzzard, blue monkeys, bushbuck, water bucks, and buffaloes.