Eranattu (Erattu) is a prominent Nair tharavadu of Kangazha in Kottayam District, Kerala State, India. Tharavadu is a system of joint family practiced by people in Kerala and each Tharavadu has a unique name. According to known history, Kangazha was once part of the United Kingdom, and was under the control of two Madampaies (Local lords as representatives of the king for the maintenance of law and order as also tax collection) Ranni Kartha and Agasthanathu Nair.