The River Cam flows through the heart of Cambridge, extending approximately 49 miles from Debden in Essex into the Great Ouse near Pope's Corner at Ely. The picturesque river is a top spot for outdoor recreation throughout the year, offering official public boating moorings on both sides of the river near Jesus Lock and at the bridge at Clayhithe. Small boat and rowing craft enthusiasts can navigate approximately 40 miles of the river to its terminus at the Great Ouse, which connects to the River Nene and England's canal system. Great fishing opportunities are offered along the river's clear waters, which are believed to still be home to native fish species burbot, previously presumed to be extinct since the 1970s. Visitors can also swim along the upper portion of the river year-round at Granchester Meadows.