An earthen fort along the border of Vadakkumkoor and Thekkumkoor, it beginning from Athirampuzha, it extended to Kondur (east of Palai). Initially, the Thekkumkur boundary was the Western Ghats (Sahyadri Mountains) to the Vembanadu Lake (Vembanadu Kayal) and the Kanakkary to Kaipattoor (Kadavu) in Achankovil River. In the late 18th century, however, the area of the kingdom declined. As a Dutch map of AD1743 indicates, the boundaries are;