The bus from Adana to Gazientep is fast, cheap and comfortable.
After visiting friends in Adana we took a bus to Gazientep which took about 2.5 hours and cost 160 TRY per person. It was a very comfortable bus with three seats in a row and shortly after departure tea/coffee/coke/water was served along with a little cake.
The Gazientep Otogar (bus station) is located 6kms from the centre of the city. You can take a bus or taxi to the centre, but will need a Gazientep Card for the bus or you can use a contactless card if you have one (and if it’s working).