But except for a short stretch north of Luang Prabang , traveling the river itself , which runs from China through Myanmar -LRB- formerly Burma -RRB- Thailand , Laos , Cambodia and Vietnam , was almost unheard of , and much of the 2,610-mile-long Mekong , home to some 1,200 species of fish , remained unknown .
Thailand /location/location/contains Mekong
Cambodia /location/location/contains Mekong
Laos /location/location/contains Luang Prabang
Vietnam /location/location/contains Mekong
Laos /location/location/contains Mekong
CC IN IN DT JJ NN NN IN NNP NNP , VBG DT NN PRP , WDT VBZ IN NNP IN NNP -LRB- RB NN -RRB- NNP , NNP , NNP CC NNP , VBD RB JJ IN , CC RB IN DT JJ NNP , NN TO DT CD NNS IN NN , VBD JJ .