How come "are" was placed before "your lands"?
"Are" is used in front of the words "your lands" because Boromir is posing a rhetorical question. Rhetorical questions are not meant to be answered. Rhetorical questions, such as "are your lands kept safe" are meant to create a dramatic effect or to make a person's intentions known. Ex: Are you really that lazy? Ex: You didn't think that I wouldn't notice? Ex: Why are you always so nosy?