《水经注·卷二》
又往东流过陇西郡河关县北边，洮水从东南流来注人。
又东过陇西河关县北，洮水从东南来流注之。
It continues to flow east and passes north of Heguan County in Longxi County, where the Tao River flows in from the southeast.
<s>[INST] Kindly elucidate the central themes in this passage in English: 又东过陇西河关县北，洮水从东南来流注之。 [/INST] It continues to flow east and passes north of Heguan County in Longxi County, where the Tao River flows in from the southeast.</s>
Kindly elucidate the central themes in this passage in English: 又东过陇西河关县北，洮水从东南来流注之。
user
It continues to flow east and passes north of Heguan County in Longxi County, where the Tao River flows in from the southeast.
assistant