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{"type":"ROADMAP","minzoom":4,"maxzoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"mappingservice":"googlemaps3","width":"auto","height":"300px","centre":false,"title":"","label":"","icon":"PluppFsk.png","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":8,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[],"searchmarkers":"","fullscreen":false,"scrollwheelzoom":false,"locations":[{"text":"","title":"","link":"","lat":63.536205,"lon":20.772066,"icon":"/wiki/images/a/a0/PluppFsk.png","inlineLabel":"\u00d6stra Kvarken\n"}]}
Området Kvarken ligger mellan Bottenviken och Bottenhavet, ungefär i jämnhöjd med Umeå på svenska sidan och Vasa och Jakobstad på finska sidan. En undervattensås går mellan svenska och finska sidan med ett flertal öar, skär och grund. Holmöarna delar området i Västra resp Östra Kvarken. Norr om Holmöarna ligger Stora Fjäderägg och i södra delen Holmögadd.
Gränsen mellan Sverige och Finland går genom Östra Kvarken, som är cirka 20 M som smalast och med mycket ojämn topografi med många grund med branta kanter. Lodet var därför inte "tjänligt som varnare" enligt äldre beskrivningar. Området var riskfyllt och fram till första världskriget ofullständigt sjömätt. På finska sidan finns flera fyrar samt fanns fyrskeppet Snipan.
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