South Waziristan ( Pashto : Ø Ù Ù Ø Û Ù Ø Û Ø Ø Ø Ø Ù ) is the southern part of Waziristan , a mountainous region of northwest Pakistan , bordering Afghanistan and covering some 11,585 kmÂ ( 4,473 miÂ ) . South Waziristan is the southern part of Waziristan , a mountainous region of northwest Pakistan , bordering Afghanistan and covering some 11,585 kmÂ ( 4,473 miÂ ) .