I think in that sentence the fog isn't really that important, it's just an excuse to tell you about the surroundings.
The speaker is probably standing near city limits. There is some sort of dock or shipyard down the river, there is some green nature stuff up the river. The river might come up later as a reference for other locations.
The speaker is probably standing near city limits. There is some sort of dock or shipyard down the river, there is some green nature stuff up the river. The river might come up later as a reference for other locations.