All the land-based passages into Juneau contain glaciers. You can‘t build roads or railroads on top of glaciers because glaciers are massive moving slabs of ice. Whenever the glacier would move, the road or railroad tracks would be ripped apart. So instead they have “marine highways” into the city which are basically ferries that are connected to the highway system (plus there’s an airport too).
Juneau, Alaska, is surrounded by big mountains and water. It’s really hard to build roads through those tall mountains, and you can’t build a road over the water! That’s why there’s no road or railroad to Juneau. The only way to get there is by boat or plane, because it’s just too tricky to build a road through such rough land.
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