Muang Ngeun is a city in Sayaboury Province.
Muang Ngeun isn'r really a town but series of mostly Tai Lue villages spread out along The road
Border from Ban Huay Kon
the main reason to get in Muang Ngeun is Passing the border From Ban Huay Kon (Thailand) Meny don't know but the border with Thailand ( Ban Huay Kon – Muang Ngeun ) is open for a while (year or two ) also for foreigns . you can get a visa on arivel an the both sides of the border. ( you need to bring a picture for the visa ) the main problem is that the bus to UdomXai is at 12 from The Bus station. So if you don't want to spend a night In Muang Ngeun ( It is not so bad thing ) you Should pass the border in the morning.
by bus \ Sawngthaew
a bus from Udomxai
a bus from Pak beng
you can go around by foot ( anyway you don't have a choice.. )