INTRODUCTION Located in the central Pacific between 4° and 14°north latitude and 160° and 173° east longitude, the Marshall Islands consist of two nearly parallel groups (the Ratak or Sunrise and the Ralik or Sunset Chains) of twenty-nine atolls and five table reefs, totalling 181 km2 of land and 10,455 km2 of lagoon area. Together these two chains extend about 1,130 km north to south and appro...