 Visitors often follow the climbing trails which ascend from Lake O'Hara to Lake Oesa and to Opabin Lake.The number of people who access the area by bus has been limited in order to preserve the sensitive alpine environment.The area is named after Colonel Robert O'Hara, an Irishman from Derryhoyle, Galway who heard about the area from J.J. McArthur, a government surveyor.