Women living along this river collect and sell green algae used to make kaipen. A region of this river called the “4,000 islands” is created (20[1])by the widest (0[1])waterfall in the world, (20[1])Khone (20[1])Falls. (20[5])This river’s (20[1])Xayaburi (“sigh-ya-BOO-ree”) dam will include “fish elevators” to help (20[1])movement of a giant catfish named for it. (20[3]0[1])The confluence of this (20[1])river with (20[1])the Ruak forms (20[1])the drug-producing (20[1])(*) Golden Triangle. (10[4]0[2])This river (10[1])meets the (10[1])Nam Khan at the monastic city of Luang Prabang. (10[1])This (10[1])river flows past (10[1])the Tonlé Sap lake (10[1])and through Vientiane (10[2])(“vee-en-chan”) and Phnom Penh (0[1])(“puh-NAHM PEN”) before meeting the South China Sea near Ho Chi Minh City. The border between Laos and Thailand is established along, for 10 points, what major Southeast Asian river? (10[3])■END■ (10[3])