While we usually think of Wordsworth as a nature poet, in this sonnet he describes London as he sees it from a distance in the early morning before all the activity and noise of the day begins. He sets the city in the context of nature so that it seems a part of the natural landscape. A first image that compares the city to the natural world is:
The beauty of the morning; silent, bare
This describes the city before it has awoken, but it could easily describe a natural setting: morning is silent and bare in nature while everything still sleeps.
Another image that sets the city in a natural context is:
Ships, towers, domes, theatres, and temples lie
Open unto the fields, and to the sky
We tend to think of natural objects like hills or lakes as open to the fields and the sky, but in the quote above it is man made objects.
Below we see how nature interpenetrates and is part of the city:
Never did sun more beautifully steep
In his first splendour, valley, rock, or hill;
Ne'er saw I, never felt, a calm so deep!
The river glideth at his own sweet will
Again, the above quote shows the city imbedded in nature, while the sun gleams on the city's structures--its street, the stones of the buildings and the buildings themselves as it rises ("In his first splendor) as if these objects were valleys, rocks or hills.
Wordsworth describes the city in its silence, repose and beauty as if it were a natural object.