Closest is related to Sun. Sun is the opposite of Cloud. Cloud is related to Component. Component is related to Letter. 
Temperature is related to Heat. Heat is related to Desert. Desert is related to Valley. you are likely to find River in/at/on Valley. 
Closest <--RelatedTo--> Sun <--Antonym--> Cloud <--RelatedTo--> Component <--RelatedTo--> Letter 
Temperature <--RelatedTo--> Heat <--RelatedTo--> Desert <--RelatedTo--> Valley <--AtLocation-- River 