In June 2022, a giant freshwater stingray that was given a name that means “full moon” was caught in this river, and was measured to be the largest freshwater fish in the world. The completion of a dam on a tributary of this river, the Sesan, subermerged the villages of Srekor and Kbal Romeas. Ghostly lights attributed to phaya nak that are alleged to appear annually on this river are called (*) Naga fireballs, and in Shan folklore the Nagas are regarded as the creators of this river. (-5[1])The upper reaches of this river in Qīnghǎi (“CHING-high”) and (10[1])Yúnnán are called Láncāng, (-5[1])and another name for this river is Cửu Long (“cue-long”), meaning ‘nine dragons’. This river flows through the capitals of Vientiane ("vee-en-tee-AN") and Phnom Penh ("peh-NOM PEN”). For 10 points, Ho Chi Minh (10[1])City is located in the delta of which river? ■END■ (10[1])