What is the westernmost and smallest of three federal territories?

The westernmost and smallest of three federal territories is Putrajaya. It is located in Malaysia and was established in 1995 as the country's administrative centre. Putrajaya is situated south of Kuala Lumpur and is known for its modern architecture, including the Putra Mosque, the Perdana Putra (Prime Minister's Office), and the Seri Perdana (Prime Minister's official residence).