A couple of recent news articles have reported sea turtles in unusual locations.

Not as unusual:
Rare Leatherback Turtle Spotted Off Coast
http://www.koin.com/Global/story.asp?S=7013170
Synopsis: PORTLAND - One of the world's most critically endangered sea turtles made a surprise appearance along the Oregon Coast. Four fishermen recently spotted the

More unusual:
Whale watchers baffled by mysterious creature
http://www.fishupdate.com/news/fullstory.php/aid/8459/Whale_watchers_baffled_by_mysterious_creature_.html
Synopsis: The last time a giant sea turtle was spotted in Icelandic waters was off the eastern Westfjords in 1963. That one was over six feet long and weighed 375 ...

Iceland has to be at the pretty extreme northern range for loggerheads and apparently have not been sighted there for a LONG time!