In the days of old, Pi‘inaio Stream entered the ocean as a wide, winding kahawai, bringing fresh waters from the mountain valleys. These waters created the great abundance of the area, from wetland fields, to fishponds linked by narrow footpaths. The stream also carried muddy, nutrient-dense waters into the sea, creating rich offshore fishing. Pi‘inaio shaped the physical and social landscape of the ‘ili of Kālia. It was a dominant in the life of Waikīkī.
An ʻōlelo noʻeau (Hawaiian proverb/saying) speaks of the pleasant portion of the coast of Kālia in Waikīkī: Ke kai wawalo leo leʻa o Kālia, The pleasing, echoing sea of Kālia. (Pukui)