The word 鄱阳湖 is formed by combining the place name 鄱阳, which refers to the Poyang region, with the character 湖, meaning "lake", thereby directly identifying the lake associated with that area.
Word Definition - 鄱阳湖
pó yáng húPoyang Lake in Shangrao 上饒|上饶[shàng ráo], Jiangxi