Langa Langa Lagoon or Akwalaafu is a natural lagoon on the West coast of Malaita near the provincial capital Auki within the Solomon Islands. The lagoon is 21 km in length and just under 1 km wide. The "lagoon people" or "salt water men" live on small artificial islands built up on sand bars over time where they were forced to flee from the headhunters of mainland Malaita.