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).