The Corran Ferry is 8 miles south of Fort William. The crossing only takes about 5 minutes and it is every half hour from 7am-9pm from easter to October.  

Turn left getting off the ferry and follow signs for Kilchoan. Once in Kilchoan ,Achnaha is a 15 minute drive away. Drive straight through the village untill you come to the second cross roads, turn right (signposted Sanna, Lighthouse) Follow the road and you will shortly come to another crossroads, turn right (signposted Achnaha, Sanna) and follow the road. Carry on down the road and you will come to Achnaha.