Assertion: country's river | /r/HasProperty | tributaries of the mekong
Facets:
Source sentences:
text: The general slope of the land in Laos is downhill from east to west, and all the major rivers—the Tha, Beng, Ou, Ngum, Kading, Bangfai, Banghiang, and Kong—are tributaries of the Mekong (Mènam Khong).