Thunguri Wetmill is part of Kibirigwi Farmers’ Cooperative Society, one of a few washing stations that form the co-op in Karatina, Kirinyaga county. The co-op works with over over 1,100 local small farmers. Kirinyaga county borders Nyeri, lying between the Eastern base of the Aberdare Range, which forms part of the Eastern end of the Great Rift Valley, and the Western slopes of Mt. Kenya. The combination of fertile soil, seasonal rainfall and high altitude provide the ideal climate for coffees characterised by high acidity, full body and ripe fruit flavours. Due to the cool temperatures at altitude, particularly at night time, coffees from Nyeri tend develop and mature slowly producing very dense, hard beans high in acidity and complexity.