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If you are coming from Tbilisi, you can take any car going towards the West (i.e. Kutaisi, Poti, Batumi, Zugdidi) as they will all have to pass through Chashuri Khashuri (ხაშური). Chashuri Khashuri is something like the major crossroad in the middle of the country. When approaching it from Tbilisi, just look for the signs that point towards Bakuriani, Borjomi and Akhalzikhe. Get out when a gas station splits the road, shortly after a roundabout. Just walk a few metres down that road - it will be easy to stop cars directly after the gas station. Be aware that Borjomi is quite a 'stretched' little town, so don't leave the car immediately after entering it, but rather when you see a large bridge to your left.

You will have to walk for a while on the main road next to the river. You can try to stop cars at any point - the road leads through several villages to Akhalzikhe, which will be your main crossroad where you can decide to either continue your way to the cave town of Vardzia (South) or across the mountains towards Batumi (very few cars!! Do not attempt to cross them between October-May).