Tuvalu, Nanumanga, Bathymetry Chart, 1 :25 000

Nanumanga Island, located at 6 degrees 17'S and 176 degrees 19'E, is a low reef island comprising a single island approximately 3.7 km long along the N-S axis, and 1.6 km wide along the E-W. The island is surrounded by a fringing reef, with small central brackish-water lagoons. The surveyed area extends to an average of approximately 4.0 km, with maximum coverage of 7.3 km from the coastline to the north. The resultant data from the SOPAC marine survey for Tuvalu in 2004 was used to produce 9 bathymetry charts for Tuvalu at scales ranging from 1:20 000 to 1:50 000 and the Nanumaga bathymetry chart is available for download under Distribution Info.
This work was initiated by the SOPAC/EU Reducing Vulnerability of Pacific ACP States Project (Task no.: TV 1.1.1).To provide a descriptive picture of the ocean bottom terrain, vividly revealing the size, shape and distribution of underwater features, and serve as the basic tool for scientific, engineering, marine geophysical and environmental studies, as well as marine and coastal resource management.The water depth within the survey area around Nanumanga ranges from 9.2 to 2054.2 m. The mapped scarps in the survey area around Nanumanga can be separated into those with headscarps occurring in water depths of approximately 80 to 100 m, and those that predominate at, or are deeper than, 500 m below sea level.