On Oʻahu, the Waikīkī and Ala Moana areas are especially vulnerable to coastal erosion and flooding linked to sea level rise. That’s because they were once wetlands, ponds and waterways until they were drained for the Ala Wai Canal. Our partners at the UH Mānoa Center for Oral History have some firsthand memories introduced by ethnic studies professor Ty Kāwika Tengan.