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Two maps about irrigation systems on Java. The first shows areas where systems are in place or being created, with their size. The second map shows Java divided into irrigation departments (both on trial and in operation).

A navigation map of the northern tip of Sumatra, featuring bathymetry (sea depth), reefs, shoals, and side views of landmark mountains (elevations). Lighthouses are highlighted in red and yellow, with lines to indicate the limits of their range.