| gptkbp:instanceOf | gptkb:island 
 | 
                        
                            
                                | gptkbp:administeredBy | gptkb:Cardiff_Council 
 | 
                        
                            
                                | gptkbp:area | 0.35 km² 
 | 
                        
                            
                                | gptkbp:country | gptkb:Wales 
 | 
                        
                            
                                | gptkbp:distanceFromLondon | about 6 km 
 | 
                        
                            
                                | gptkbp:distanceFromWestonSuperMare | about 8 km 
 | 
                        
                            
                                | gptkbp:firstRadioTransmissionBy | gptkb:Guglielmo_Marconi 
 | 
                        
                            
                                | gptkbp:firstRadioTransmissionYear | 1897 
 | 
                        
                            
                                | gptkbp:hasFogHorn | yes 
 | 
                        
                            
                                | gptkbp:hasFreshwaterWells | yes 
 | 
                        
                            
                                | gptkbp:hasLighthouse | gptkb:Flat_Holm_Lighthouse 
 | 
                        
                            
                                | gptkbp:hasMonument | yes 
 | 
                        
                            
                                | gptkbp:hasNatureReserve | gptkb:Flat_Holm_Nature_Reserve 
 | 
                        
                            
                                | gptkbp:hasRuins | Victorian barracks 
 | 
                        
                            
                                | gptkbp:hasSSSIStatus | yes 
 | 
                        
                            
                                | gptkbp:hasUniqueSpecies | gptkb:lesser_black-backed_gull wild leek (Allium ampeloprasum)
 
 | 
                        
                            
                                | gptkbp:hasVisitorCenter | yes 
 | 
                        
                            
                                | gptkbp:hasWWIIFortifications | yes 
 | 
                        
                            
                                | gptkbp:highestPoint | 32 m 
 | 
                        
                            
                                | gptkbp:locatedIn | gptkb:Bristol_Channel 
 | 
                        
                            
                                | gptkbp:notableFor | gptkb:nature_reserve gptkb:lighthouse
 WWII fortifications
 
 | 
                        
                            
                                | gptkbp:population | 0 
 | 
                        
                            
                                | gptkbp:protectedBy | gptkb:Flat_Holm_Project 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Bristol_Channel 
 | 
                        
                            
                                | gptkbp:bfsLayer | 5 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Flat Holm 
 |