Ethiopian Airlines has flights connecting Bahir Dar, Gonder, Lalibela, Mekele and Aksum.
The 2500km circular drive through the north is now nearly all sealed (though still expect some rough sections). The exception is the 45km from Debark to Zarima. This stunning stretch of road, along with a further 30km on to Adi Arkay, snakes down the western end of the Simien Mountains and is one of Africa’s most beautiful roads. It makes the Blue Nile Gorge seem like a Sunday drive in comparison.
The only areas in which you’ll have trouble finding regular public transport are the Simien Mountains National Park and around the rock-hewn churches of Tigray, though it’s possible in both.
To visit the Danakil Depression, you must travel with a tour company.