Jiuquan, formerly known as Suzhou is a prefecture-level city in the northwesternmost part of Gansu Province in the People's Republic o…Jiuquan, formerly known as Suzhou is a prefecture-level city in the northwesternmost part of Gansu Province in the People's Republic of China. It is more than 600 km wide from east to west, occupying 191,342 km, although its built-up area is mostly located in its Suzhou District.