premise: The Hun River (渾河, "the muddy river") is a river in Liaoning Province, China, and was formerly one of the largest tributaries of the Liao River. It was also formerly known as Shen River (瀋水). Two of Liaoning's most important cities, the provincial capital Shenyang and the seventh largest city Fushun, are located on the Hun River.
hypothesis: The Hun River is in the southern hemisphere
reason: system does not understand the geographical concept of a hemisphere. I often beat the system with this.