Phong Nha (also known as Son Trach on google maps – https://goo.gl/maps/S26Uk ) is situated along the Ho Chi Minh Highway East (Ho Chi Minh Dong). The town is about 45km north west of Dong Hoi. You will either be arriving on the Ho Chi Minh East, or coming into the area along the Ho Chi Minh West (Tay). If arriving from Hanoi or from Dong Hoi, you will be arriving in on the HCM East, and you should look out for the large “PHONG NHA-KE BANG” sign on the side of the mountain. It is similar in looks to the famous ‘HOLLYWOOD” sign, and is lit up at night. When you see this sign, turn off the highway towards the sign, and follow the road past around the back of the mountain. Easy Tiger is on the left hand side as you drive into town – you will need to drive past it and do a U-turn at the next turning point.
If arriving from Khe San along the very scenic Ho Chi Minh West road, you will eventually come to a large bridge, and just after the bridge is a crossroads. At the crossroads, turn right, and follow that road for around 15km. You will pass through the entrance gate of the National Park, and if you keep going you will eventually get to a T-junction, with a big stone totem pole in front of you. Turn right there, and drive through the town for about 4km, whereupon you will eventually see Easy Tiger on your right. Good luck! Please remember that it takes most of a day to ride from Khe San, 8-9 hours, so start early and take some spare fuel with you.