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[Niddhoger]

Off the top of their head, does anyone know the minimum amount of land tiles needed for embarkation? I was wanting to build some bridges around my world for shiggles.  For islands just off the coast, I can do a 2x10 embark across two embarks starting from the land and going outwards.  However... for longer projects I'll need to cast obsidian in the middle of the ocean.  This actually creates land, since just building floors and bridges do not actually count as "land."  Before I waste several hours experimenting, does anyone know a rough figure? I know each map tile is 48x48, but dredging up magma from the bottom of the map and dragging it 100+ tiles across the ocean will take quite a large amount of dorfpower even using minecarts on windmill/waterwheel powered rollers. 

Do I need a full 48x48 (2304 tiles!) of cast obsidian to embark on? Do I need a full 2x2 worth of map tiles? Can I get buy on just 10x10? Again, I'll be doing 2x16 embarks to cast as few obsidian islands as possible.

[Larix]

In order to embark, you need at lest one embark tile in a proper biome - not mountain and not ocean. Three quick tests suggest a tile bordering the ocean must be _entirely_ non-ocean to count, i.e. no spot of ocean or beach in the whole 48x48 square. Worldmap tiles that are technically ocean can have a few specks of normal land, but that doesn't make them embarkable. Ocean beaches may be solid, but no surface crops can grow on them; they count as part of the fully sterile "ocean" biome and they don't matter for embark-ability.

I'm quite sure that casting obsidian doesn't change the biome of a location, so i wouldn't expect obsidian-casting to make ocean locations embarkable. There should be no difference to built floor and bridges.

You could just use the embark anywhere utility and use constructions to give yourself a foothold for mid-ocean embarks.