The place they selected to go down was known to have one of the strongest Continental Barriers. That said, it could have two reasons. One, it is closer to the source of the Continental Barrier Energy, or the channels that connect to that place are far wider. Regardless of the reason, both options were a good choice to select this entrance.
But then again, the twins' group was already prepared for a long journey. First, there was no way to use Spatial Gates here since you couldn't fix a point of exit. And second, considering that the Continental Barriers extended all the way to the end of the Realm of Gods, even if they entered it here, it was bound to be a long distance to the source.
