North through east Austria.
From Hainburg, over the Danube. This #49 road busy, so we tried out the 'Kamp Thaya March' cycle trail, which starts at Stopfenreuth, well signed. But where does it go?? - N up R March valley OK. We followed this quiet but meandering route until Marchegg, where we have it up and used the #49, now quiet.
Eventually it takes you into Czech SW of Breclav. Recommended.