Just how deep is peat? Peat can range in depth, with our lowland bogs typically 5 to 10 metres deep and our blanket bogs up to 5 metres. Peat depth increases by up to around one millimetre each year, meaning that a metre of peat can take 1,000 years or longer to form! It takes 50 years to lock up carbon equal to the weight of a two-litre bottle of water in a square metre of peat. In 1,000 years, this will have locked up about 40 kg of carbon, the weight of 20 full bottles. Peatland restoration i