From Bushwalk Australia
An area of muddy ground into which walkers can sink to some degree.
Bogs can occur naturally, but on Tasmanian bushwalking tracks in wet regions, they usually develop by the plant life whose roots holds the soil together being destroyed by the repeated trampling of bushwalkers.
When encountering a bog on a walking track, it is recommended that walkers continue walking through the mud, rather than walking around it, to reduce further destruction of vegetation nearby which would be likely to increase the size of the bog over time. Walking around a bog can also make it difficult to find the track on the other side of the bog, with some bogs being very wide and a maze of false pads often developing around them due to walkers trying to avoid the mud.
For this reason, bushwalkers in Tasmania should expect to get wet, dirty and muddy. Gaiters are often worn by walkers to help keep mud out of their boots (amongst other reasons) when walking through bogs.
Although bogs occur in a variety of situations in Tasmania, the button grass plains are particularly renowned for including substantial sections of bog on any track that passes through them. The Frenchmans Cap track passes through one such area called the 'Lodden Plains' which are commonly known amongst bushwalkers as the 'Sodden Lodden'. The Arthur Plains are also well known for including a lot of bog, which affects several walking tracks that pass through it, including the tracks to the Western Arthur Range and the Port Davey Track.