Yep, you are right.
But I was not sure myself where to put my pictures from Hawaii and I asked Hive account@czechglobalhosts, the organizer. His answer was North America - see the exchange here: https://steemit.com/travel/@libork/re-czechglobalhosts-7-world-s-continents-photo-challenge-tuesday-of-antarctica-and-world-s-oceans-week-33-the-absolute-winner-takes-200-sbd-20180508t090833378z

I guess that this is what matters here...