[x1stcav]

From what I can see on these two links the Bassac River was strictly PBR country, but I didn't follow all the links.

http://www.pacifier.com/~sivie/pbr/p0469.htm

http://www.pcf45.com/sealords/sealords.htm

Hope this helps.

[Bonaparte]

Oh, man! You bet that helps! Especially the map that clearly shows the Bassac is not only a separately named river but isn't even a part of the Mekong river system.