sentences:  Wusong is named for the Wusong River, a former name for Shanghai's Suzhou Creek.Suzhou Creek is now a tributary to the Huangpu River, emptying into it in Puxi across from Lujiazui and just north of the Bund.The Huangpu had previously been a tributary to the Wusong, but the two reversed their importance when a flood caused it to gain a number of the Wusong's former tributaries.