Sindh (Sindhī: سنڌ, is one of the four provinces of Pakistan and historically is home to the Sindhis. Different cultural and ethnic groups also reside in Sindh including Urdu-speaking Muslim refugees who migrated to Pakistan from India upon independence as well as the people migrated from other provinces after independence. The neighbouring regions of Sindh are Balochistan to the west and north, Punjab to the north, Gujarat and Rajasthan to the southeast and east, and the Arabian Sea to the south. The main language is Sindhi. The Assyrians (as early as the seventh century BCE) knew the region as Sinda. The Persians as Abisind, the Greeks as Sinthus, the Romans as Sindus, the Chinese as Sintow, in Sanskrit, the province was dubbed Sindhu meaning "Ocean" while the Arabs dubbed it Al-Sind.