How Many Countries In South Asia?

South Asia typically consists of India, Pakistan, Bangladesh, Sri Lanka, Nepal, Bhutan, Maldives, and British Indian Ocean Territory(of whom Diego Garcia is the largest island).
Although those are the agreed upon countries, but some definitions by academic, cultural institutions from the USA and UK term following countries and territories as part of South Asia too, which includes:
Afghanistan(Originally Part of Central Asian or Middle-Eastern),
Myanmar(Originally Part of South east Asia),
Tibet(Originally Part of East Asia or Central Asia),
and
Iran(Originally Part of South West Asia)

South Asia comprises of India, Sri Lanka, Pakistan, Nepal, Bangladesh, Bhutan and the Maldives. Surprisingly Afghanistan and Burma ( not Myanmar, the name that the military junta rechristened Burma as ) are not always considered to be a part of South Asia. The prominent regional groups that constitute South Asia such as SAARC, include Afghanistan but not Burma.