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 km², although its built-up area is mostly located in its Suzhou District.