Around 5,000 hours of work was put in this year by John Muir Trust (JMT) conservation volunteers, the body has said.
Those who like to go walking
in Scotland's wild places may have been the beneficiaries of work carried out by 135 different people on 23 projects, which involved everything from clearing litter from Ben Nevis to removing non-native plants.
Conservation activities co-ordinator for the JMT Sandy Maxwell remarked: "Our volunteers are pretty hardy and enjoy getting out and doing conservation work in wild places."
And next year will see more of the same as the 2011 calendar of activities has been published, which includes more litter clearance activities on Ben Nevis, footpath repair work on Scheihallion and the Beach cleaning in Knoydart and on the Isle of Harris.
Earlier this year, the JMT repaired the famous Steall Bridge over the Waters of Nevis after one of its wires broke, allowing people in walking boots
to access the Mamores ridge.