From the record
“The Complex is a National Historic Landmarked pre-contact archaeological site on several properties adjacent to Hawaii Route 450 in on island. The complex includes six heiaus and two fishponds.”
Wikipedia article Complex, CC BY-SA 4.0.
One of 41 National Register listings published here for Maui County · listed in 1966 · category: District · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service