Final answer:
The East African Rift is associated with a complex or uncertain plate boundary and represents a divergent plate boundary.
Step-by-step explanation:
The tectonic feature associated with a complex or uncertain plate boundary is the East African Rift. The East African Rift is a geological rift located in East Africa where the African Plate is splitting into two separate plates: the Nubian Plate to the north and the Somali Plate to the south. This rift represents a divergent plate boundary, where the plates move away from each other, resulting in volcanic activity, earthquakes, and the formation of a rift valley.
Learn more about Plate Tectonics