Oku is a subdivision in Northwest Cameroon. The term Oku also refers to the people who live in this region and the primary language that they speak (although English is also widely spoken). Oku is a rural area containing about thirty-six villages. The nearest really large city is Bamenda, but Kumbo, which is closer (about 29 kilometres (18 mi) from the village of Keyon, or about seventy minutes by car), is large enough to have telephone lines and a Baptist-run hospital. However,three mobile telephone networks (MTN, ORANGE, CAMTEL) are available in Oku. As such, mobile internet facilities are available. Oku is also relatively near to the Nigerian border, and travel across the border is common, as many people in the region have relatives in Nigeria.
Oku is a very mountainous region, around 1,200 metres (3,900 ft) above sea level, and thus rather cool considering its latitude. It is not cold enough for snow, but at night temperatures drop below human comfort range. Mount Oku, a stratovolcano, reaches a height of 3011 metres (9880 feet) and is the second highest mountain of Cameroon after Mount Fako (better known as Mount Cameroon).
The broader Oku or Foumbot volcanic field also includes many scoria cones and maars, several of which are filled by crater lakes. Lake Oku is a cratert lake. Two of the crater lakes, Lake Nyos and Lake Monoun, have been the subject of extensive research. Quantities of gas build up in the lakes and occasionally are released; being heavier than air, they pour down the mountainside and can suffocate entire villages. Some of the locals believe that a god lives in the lake and must be appeased.