Bog snorkelling is a sporting event that consists of competitors completing two consecutive lengths of a 60-yard water filled trench cut through a peat bog, in the shortest time possible. Competitors must wear snorkels and flippers, and complete the course without using conventional swimming strokes, relying on flipper power alone. Wet suits are not compulsory, but are usually worn.

Results
The World Mountain Bike Bog Snorkelling Championship first took place in 2000. Although no event was run in 2001, since then, it has been a yearly event. The special preparation for the bikes consists of the tires being filled with water and the bike frame with lead.
The Bog Snorkelling Triathlon was inaugurated in 2005. The first event took place on 10 July, and was sponsored by Young's Bitter. The event consists of a run of approximately 12 miles, a bog snorkel of approximately 120 yards through the "Bog Trench" and a 25 mile mountain bike ride. There is both an individual and a team relay event.
A Northern Ireland bog snorkelling championship takes place in Dungannon, in County Tyrone.