The faraway continent across the ocean was too distant for Jonathan, but regarding the Dark realm, he had to be cautious and go check it out - for the Dark realm, it was completely worth a long trip.
He started considering the feasibility of long-distance travel via spatial vortexes, then quickly denied that method. As defying nature as spatial vortexes were, the maximum teleportation range was still just over 400 km. That continent was over 10,000 km from Jonathan's hometown, just a linear distance.
When moving via vortexes, Jonathan had to calculate coordinates in advance and pick suitable islands as stopovers. With the vast ocean, what were the odds he could always find appropriately distanced islands for stopovers? He roughly glanced at a map - conservatively estimated he'd need at least thirty spatial jumps.