How to build an oil well in a lake??

I wonder if the water south of the oil lake is ocean, u could drop down other city there and built forts to reach the oil lake and that way u can get the work boat up there and after it done building a oil well, u raze there city if u don't want it.

And about the three fishes in ice land town, try building fort at there end of penisula and send a work boat through it, and if it succeeds, well enjoy.
 
Last time I played civ5, water surrounded by land and ice was counted as a lake. So, looks like he has a bunch of lakes up there.
 
it is in fact ocean... I never had problems with creating ships in lakes...
 
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