Udayagiri Fort is located at Puliyoorkurichi on the Thiruvananthapuram –Nagercoil National Highway in Kanyakumari District of Tamilnadu. This fort, also known as De Lannoy's Fort or Dillannai Kottai, stands as a remnant of the historic Travancore regime. It is built of massive granite blocks and it covers an area of 90 acres, enclosed by isolated hills that are almost 260 feet in height. Udayagiri Fort was named after the King Udayanan of Padmanabhapuram.
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