Mailsi City is historical place and tehsil of District Vehari. Mailsi is famous for cotton yield as it is more than that of Sindh. Badshahi Mosques of Jallah Jeem and Malik Wahn of historical woth. Jhandir Library is known as biggest Private Library of Asia. Mailsi Head Siphon or Head Syphon is a construction here on Sutlej River and Sindhnai Mailsi Link Canal. Mailsi is Tehsil since 1948.