Here's why:
* Preposition: "In" is a preposition, indicating location.
* Object of the preposition: "the east" is the object of the preposition.
* Function: The phrase "in the east" modifies a verb or adjective, telling us where something is located.
Example:
* The sun rises in the east. (Here, "in the east" modifies the verb "rises" and tells us where the sun rises.)
* The city is known for its beautiful temples in the east. (Here, "in the east" modifies the noun "temples" and tells us where the temples are located.)