| gptkbp:instanceOf | gptkb:marine 
 | 
                        
                            
                                | gptkbp:area | 570,000 square kilometres 
 | 
                        
                            
                                | gptkbp:borderedBy | gptkb:Belgium gptkb:Denmark
 gptkb:France
 gptkb:Germany
 gptkb:Netherlands
 gptkb:Norway
 gptkb:United_Kingdom
 
 | 
                        
                            
                                | gptkbp:climate | temperate 
 | 
                        
                            
                                | gptkbp:connectedTo | gptkb:Atlantic_Ocean gptkb:Baltic_Sea
 gptkb:English_Channel
 gptkb:Kattegat
 gptkb:Skagerrak
 
 | 
                        
                            
                                | gptkbp:ecosystem | gptkb:North_Sea_ecoregion 
 | 
                        
                            
                                | gptkbp:hasIsland | gptkb:Dogger_Bank gptkb:Frisian_Islands
 gptkb:Heligoland
 gptkb:Orkney_Islands
 gptkb:Shetland_Islands
 
 | 
                        
                            
                                | gptkbp:hasMajorPort | gptkb:Antwerp gptkb:Bremen
 gptkb:Hamburg
 gptkb:London
 gptkb:Rotterdam
 
 | 
                        
                            
                                | gptkbp:historicalEvent | gptkb:Battle_of_Jutland gptkb:Battle_of_the_North_Cape
 
 | 
                        
                            
                                | gptkbp:inflow | gptkb:Baltic_Sea gptkb:English_Channel
 
 | 
                        
                            
                                | gptkbp:knownFor | fishing oil production
 shipping routes
 gas production
 
 | 
                        
                            
                                | gptkbp:locatedIn | gptkb:Atlantic_Ocean gptkb:Europe
 
 | 
                        
                            
                                | gptkbp:marineLife | cod herring
 mackerel
 porpoises
 seals
 whales
 seabirds
 
 | 
                        
                            
                                | gptkbp:maximumDepth | 700 metres 95 metres
 
 | 
                        
                            
                                | gptkbp:outflow | gptkb:Atlantic_Ocean 
 | 
                        
                            
                                | gptkbp:salinity | 34-35 PSU 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Ultimate_Angel 
 | 
                        
                            
                                | gptkbp:bfsLayer | 7 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Northern Sea 
 |