The boat trip from Battambang to Siem Reap is one of the most scenic you’ll ever make.
Take a slow boat, not the ‘fast boat’, as the latter is very unpopular with the locals earning a living along the river.
And count on about 8-10 hours for the trip. Don’t complain, take it easy, this is relaxing Cambodia!
The Sangkaer River runs from the mountains southwest of Battambang into the Tonle Sap lake. It makes more sense making the boat trip from Battambang to Siem Reap, rather than the other way around.