wiki/List_of_districts_of_Kerala
https://en.wikipedia.org/wiki/List_of_districts_of_Kerala#/media/File:Political_map_of_Kerala.svg
Northern Kerala districts of Kasaragod, Kannur, Wayanad, Kozhikode, Malappuram; the Central Kerala districts of Palakkad, Thrissur, Ernakulam, Kottayam, Idukki; and the Southern Kerala districts of Alappuzha, Pathanamthitta, Kollam and Thiruvananthapuram.[4] Such a regional division occurred being part of historical regions of Cochin, North Malabar, South Malabar, and Travancore.[5] North Malabar region includes Kasargod, Kannur, Wayanad, and the northern region of Kozhikode district, South Malabar region includes south-central part of Kozhikode district, Malappuram, parts except Chittoor taluk of Palakkad district, Kunnamkulam and Chavakkad region of Thrissur district. The regions of South Malabar and Kingdom of Cochin, both of which share many historical, geographical, and cultural similarities, together constitute the districts of Central Kerala.[5][6] The Travancore region is incorporated in the districts of South Kerala.[7] The Travancore region was again divided into three zones as Northern Travancore (Hill Range) (Idukki District, Kottayam district and eastern portion of Ernakulam district), Central Travancore (Central Range) (Kollam district, Pathanamthitta and Alappuzha district) and Southern Travancore (Southern Range) (Thiruvananthapuram).[8]