The Question and Answer section for Robert Browning: Poems is a great resource to ask questions, find answers, and discuss the novel.
The speaker really has an internal voice going on here: it's like he is just noticing the landscape around him thinking, "oh a yellow moon". The second stanza tells us this guy is on a mission. There is a sense of direction and focus to his...
The speaker describes the long barren landscape as a "grey sea". I think this speaks to the mood and texture to the poem. There is a sense of emptiness to this.
I'm not sure what poem you are referring to and what your question is.