The state of Kerala is divided into 14 revenue districts. On the basis of geography the state's districts are generally grouped into three parts :- The "North Kerala" districts of Kasaragod, Kannur, Wayanad, Kozhikode ; the "Central Kerala" districts of Palakkad, Thrissur, Ernakulam, Idukki, Malappuram, Kottayam and the "South Kerala" districts of Thiruvananthapuram, Kollam, Alappuzha, Pathanamthitta. Such a regional division occurred being part of historical Kingdoms of Kochi, Travancore and British Province of Malabar. The Travancore region is again divided into three zones as Northern Travancore (Hill Range) (Idukki and parts of Ernakulam), Central Travancore (Central Range) (Pathanamthitta, Alappuzha and Kottayam) and Southern Travancore (South Range) (Thiruvananthapuram and Kollam). Almost all of the districts in Kerala have the same name as the important town or city in the district, the exception being Idukki district, Wayanad district& Ernakulam district. The 14 districts are further divided into 75 taluks, and 941 Gram panchayats. Some of the districts and their towns were renamed in 1990 like Thiruvananthapuram (formerly known as "Trivandrum"), Kollam ("Quilon" or "Venad"), Alappuzha ("Alleppey"),As per GO(P) No.133/90/RD dated 7.2.90, Government of Kerala Thrissur ("Trichur" or "Thirushivaperur"), Palakkad ("Palghat"), Kozhikode ("Calicut") and Kannur ("Cannanore").