The northern parts were once covered by veen -LRB- bogs -RRB- which separated the dryer and more arable south from Drenthe and which have been exploited as fuel to a large degree .

The northern parts were once covered by veen -LRB- bogs -RRB- which separated the dryer and more arable south from LOCATION@1 . These bogs have been exploited as fuel to a large degree .
