The Punjab, also spelled and romanised as Panjab, is a geopolitical, cultural and historical region in South Asia, specifically in the northern part of the Indian subcontinent, comprising areas of eastern Pakistan and northern India. The boundaries of the region are ill-defined and focus on historical accounts. The geographical definition of the term "Punjab" has changed over time: in the 16th century Mughal Empire it referred to a relatively smaller area lying between the Indus and the Sutlej rivers. In 1947, the Punjab Province of British India was divided along religious lines into West Punjab and East Punjab. The western part was assimilated into Pakistan while the east became part of India.