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A map to aid navigation around the Bay of Touranne (Bay of Turon, location of modern city of Da Nang, Vietnam). The web of lines is a rhumbline network, and bathymetry (sea depth), anchor points and two elevation views of the coasts are shown.

Map featuring the ancient kingdoms of mainland Southeast Asia. The cartouche is embellished with maritime and military paraphernalia. The map is dedicated to William IV, Prince of Orange (Guillaume Charles Henry Friso). Sheet one of two.

This map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain. Sheet two of two.

Map featuring the ancient kingdoms of mainland Southeast Asia. The cartouche is embellished with maritime and military paraphernalia. The map is dedicated to William IV, Prince of Orange (Guillaume Charles Henry Friso). Sheet one of two.

This map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain. Sheet two of two.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

The outline of the island of New Guinea is very vague on this early 17th century map of Southeast Asia. The cartouche is decorated with two figures of Asian warriors: one holds a spear, the other a sword. There are also drawings of mermaids.

The outline of the island of New Guinea is very vague on this early 17th century map of Southeast Asia. The cartouche is decorated with two figures of Asian warriors: one holds a spear, the other a sword. There are also drawings of mermaids.

Unusually, north is located to the left of this map of East Asia, rather than the top. The text notes that shallows and reefs are marked, and that the map is based on the explorations of Portuguese ships. Illustrations include sea monsters and ships.

Unusually, north is located to the left of this map of East Asia, rather than the top. The text notes that shallows and reefs are marked, and that the map is based on the explorations of Portuguese ships. Illustrations include sea monsters and ships.