What is "viyyat"

Viyyat ia a rural area located near Kariyavattom in the capital city of Kerala, India. one of the faimous temple is located in viyyat called Sree Viyyat Devi Kshethram. In this temple is very faimous for 'Mangalya pooja', 'Sarvabhista sidhi pooja', 'Saraswathi pooja', Ayillya pooja, 'Santhana saubhagya ganapathi homam' etc..