I now make a point (Easter egg) to demonstrate how travelling from Zarahemla to the land of Nephi requires travelling northward in which the
"up" so often used to describe this action refers to direction rather than elevation. Recall how Mosiah sent explorers from Zarahemla to go up to the land of Lehi-Nephi:
Mosiah 7:3 wrote:And it came to pass that on the morrow they started to go up, having with them one Ammon, he being a strong and mighty man, and a descendant of Zarahemla; and he was also their leader.
Note how they STARTED to go up on the very first day of the expedition! Hence, the beginning of the journey was on the very day they
"started" to head north which is the only way (via Delmarva model) to get to the land of Nephi by land without shortcutting eastward across the river Sidon (Pocomoke). Thus, the journey at Delmarva begins in Maryland (Zarahemla) whereafter a northern trek is necessary in order to arrive at the tail of the Virginian coast. I believe that is what Smith initially visualized as a base to form his hodgepodge of stories.
Now recall how these explorers spent forty days in search of the land of Lehi-Nephi and chanced upon a hill that was situated north of Shilom whereupon they pitched their tents. We see how being elevated on that hill and having spotted Shilom to the south is when they were able to
go down (descend) into Shilom:
Mosiah 7:5,6 wrote:And when they had wandered forty days they came to a hill, which is north of the land of Shilom, and there they pitched their tents.
And Ammon took three of his brethren, and their names were Amaleki, Helem, and Hem, and they went down into the land of Nephi.
Let's be clear that I'm not arguing the verse above
"went down" from the hill equates to a southern trek but in this case refers to elevation and descent. An example of showing descent regardless of direction is given in Alma 52:23,
"And as Teancum saw the armies of the Lamanites coming out against him he began to retreat down by the seashore, northward."