Рокский тоннель
The Greater Caucasus Mountain Range forms the northern border of South Ossetia with Russia, and the main roads through the mountain range into Russian territory lead through the Roki Tunnel between South and North Ossetia and the Darial Gorge. The Roki Tunnel was vital for the Russian military in the 2008 South Ossetia war because it is the only direct route through the Caucasus Mountains.