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I would like to use leaflet in order to display the world maritime boundaries (12 nm and 24 nm). Is there a reliable geojson source that I could use? If no geojson data is available, I am ready to use any other data format as long as I can convert it to geojson.

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    If you are seeking open data the place to ask would be the Open Data Stack Exchange. – PolyGeo Jan 8 '18 at 19:17
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A web search turned up this download site for world maritime boundaries as an ESRI shapefile. Here are directions for converting the shapefile to geojson using QGIS and here for ArcMap.

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You can use data from the OpenStreetMap project.

OpenStreetMapData is a good source. The data has been derived from OpenStreetMap ways tagged with natural=coastline. The data is offered as a shapefile. There are a lot of ways to convert shapefiles to GeoJSON.

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