Nedumkotta (Malayalam: നെടുംകോട്ട) or Travancore lines was a wall built as a protection against consistent invasion and threats from northern kingdoms mainly Zamorins of Kozhikode. It was built by the Dharma Raja Karthika Thirunal, King of Travancore with the support and permission of the Kingdom of Cochin. It passed through the territories of the then Cochin State, starting on the west coast, above Kodungallur, and stretched up to the Annamalai Hills on the Western Ghats. It was about 48 km long, twenty feet wide and twelve feet high. Its alignment was along the Periyar river, along the Chalakudy river up to the Annamalai Hills in the Thrissur district.