Shared ground
Isaiah 11:15–16 finishes the chapter’s return-from-exile picture by describing God actively removing barriers that keep scattered people from coming home. The language is dramatic: seas dry up, a major river becomes easy to cross, and a dependable “highway” appears. These images are not mainly about comfort, but about a public, safe, workable route for a “remnant” to return.
The passage also ties the future return to Israel’s foundational memory of the exodus. By comparing the new route to “the day” Israel came up from Egypt, it frames the coming home as a new, large-scale act of deliverance by Yahweh (compare Exodus 14:21–22).
Where interpretation differs (only where needed)
Some readers take the geography more literally: a real body of water linked to Egypt (“the tongue of the Egyptian sea”) and a specific “River” are altered so people can cross.
Others read the geography more as prophetic poetry: Egypt, the sea, and the River represent major obstacles and hostile powers, and “drying” and “splitting” picture God making what seemed impossible become straightforward.
A related difference concerns the “highway.” Some take it as an actual engineered route for return. Others take it as a broader image for secure passage and ordered return under God’s protection.
Why the disagreement exists
The passage uses location words (“Egypt,” “Assyria,” “the River”) but also uses elevated, miracle-like actions (“utterly destroy,” “seven streams,” “march…in sandals”) that sound like exodus storytelling. Since Isaiah often mixes concrete history with big symbolic language, readers differ on how directly to map each feature onto a specific future event.
What this passage clearly contributes
Explicitly in the text: Yahweh removes a sea barrier, acts against “the River,” turns it into “seven streams,” enables easy crossing “in sandals,” and provides a “highway” for the remnant from Assyria, in a way comparable to the exodus (Isa 11:15–16).
Reasonable theological inference: the same God who once brought Israel out of Egypt is presented as able and willing to bring scattered people home again, overcoming natural and political-scale obstacles and making return feasible and publicly visible. The focus is God’s effective provision of a safe route, not the people’s ingenuity.