Sindh ( ; ) is one of the four provinces of Pakistan, in the southeast of the country. Historically home to the Sindhi people, it is also locally known as the Mehran. It was formerly known as Sind until the 1956 Constitution of Pakistan. Spelling of its official name as Sind was discontinued in 2013 by an amendment passed in Sindh Assembly. The name "Sindh" is derived from the Sanskrit Sindhu, a reference to the Indus River that passes almost through the middle of the state.