The city name is pronounced Bueng Garn.
In Thai it is written บึงกาฬ
An aircon bus from Nong Khai will cost B100 and take 3 hours.
There are also buses from Udon Thani.
You cannot get a bus to or from Nakhon Phanom (which is the next province around the river), because they do not run.
There are plenty of tuktuks and motorcycle taxis here. Ask the price first, but they appear to be honest and will not rip you off.
It is a fairly small city so you can walk around most of it without a problem at all.
Orienting yourself - the main bypass road where the buses from Nong Khai come is about 1.5Km outside the centre of town. there are hotels and businesses along this road, and the minibus station to Nong Khai/Udon Thani is to the right as you leave the city at a petrol station opposite the Kubota dealer some 300 metres from the road into town, on the right as you leave it. To get to here costs B50 in a tuktuk.
Coming along the road into town is the bus station about 500 metres along on the right, and then you come to a roundabout where many out of town buses stop before returning to the bus station. Here there are tuktuks and motorcycle taxis. About another 200 metres is the Mekong River.
From the roundabout to the right is the hospital (and some street eats).
There are many attractions some 50Km further along the river away from the Nong Khai direction. Transport may be the problem, although there may be local buses/songteows to this area.
Some of these attractions are (in order of distance from the city):
Namtok Tham Fun ("namtok" means "waterfall")
Phu Wua wildlife sanctuary.("phu" means "mountain")
Namtok Tad Nok Kian
Namtok Chet Si
Namtok Phu Tham Phra
Bueng Khong Long
Phulangka National Park.
There are many restaurants along the riverfront, but not too many in the city itself. The riverfront ones are closed in the morning. There was one restaurant one street up from the waterfront was B100 for fried crispy pork with veggies and steamed rice. This included a large bottle of beer! It has an English menu despite few "Farangs" in the city.
If you want breakfast and are not in a hotel which provides it, you can walk around the city near the waterfront and there is at least one restaurant which provides Khao Tom (rice porridge). In addition, there are street eats close to the hospital - a couple of these have sit down places.
There are also many other hotels in this city - many of these are close to the river. The main upmarket one is apparently the "The One Hotel". A promotion was noted within the city for B790. Unfortunately, the hotel itself is located on the out of city bypass road a couple of Km from the river. It is next to the Tesco Lotus.
From the minibus stop (see above), they go to Udon via Nong Khai.