Brittany will become an island after the pole shift. In that these mountains are close to the shore, it would be necessary to get above the 200 foot mark to ensure safety during the pole shift itself, but being only 50 km from the coastlines is definitely not enough. If one is only 50 miles from the coastline, which is achievable, one should be above sea level by close to 600 feet, as this area will be washed over during the hour of the pole shift, from both directions. Fortunately, the mountains of Brittany give you this height aplenty.
ZetaTalk February 19, 2011