Plausibility Check: Colonies Outside of Mediterranean?

How plausible is it for either the Greeks or Phoeniciens to found colonies outside of the Mediterranean (mainly Gaul) around the 6th century BC? Also, how long would voyages between the Med (Gadir, mainly) and Britain take in that time period?
 
How plausible is it for either the Greeks or Phoeniciens to found colonies outside of the Mediterranean (mainly Gaul) around the 6th century BC? Also, how long would voyages between the Med (Gadir, mainly) and Britain take in that time period?
Where in Gaul? The Greeks did have Massilia after all. ;)
 
Yeah, that was poorly worded. I meant along the Atlantic coast...
Oh. Well, there really isn't that much for them to get there that would necessitate a colony's establishment, and it's kind of far away. If an expedition were mounted, it might establish a short-term trade post at someplace like the mouth of the Garonne or the Loire, but ultimately would not be profitable enough to warrant an apoikia. Sort of like how Euthydemos and Demetrios of Baktria established a loose control over territory north of the Ferghana Valley to try to grab control of the Siberian gold trade, but it wasn't profitable enough for successors like the sons of Demetrios or the Eukratidai to maintain control.
 
I believe voyages to Britain took about a month at most usually, or two months if you faced bad weather and the wrong wind direction constantly. I'm not sure if the Greeks or Phoenicians would create colonies - I really don't know enough about their mindset to judge - but I'll point out that the Greeks did trade with Britain already. Indeed, one Greek (I forget who) actually circumnavigated the British Isles and drew a map of them. I think Polybius had a fairly extensive (if inaccurate) book about the various tribes and customs of Britain, too...
 
And even earlier, there is evidence (a carving on one of the bluestones at Stonehenge) of Mycenean trading voyages to Britain ca. 1200 BC., presumeably for tin...
 
There have been found phoenician and greek ceramics in northern Spain.

If their civilizations lasted longer, I don't see why not. They don't need to travel all the way to the eastern mediterranean; Gades (Cadiz) was a phoenician city, and it already is on the atlantic. Archeological finds suggest than they had a trading post on the city of Lisbon (one theory says than the name Lisbon derives form the phoenician "Allis Ubbo", Safe Harbor). A couple centuries more and the colonies would have crept northwards to the Cantabric sea and eventually France.
 
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