This rare map is the first published map of the strategically important Strait of Singapore, which had been jealously guarded by the Portuguese for nearly a century. The map is oriented with north to the left and depicts the southern coast of the Singapore island (Sinca Pora) and the Straits of Johor (Rio Batasubar). Most of the coastline is marked as unknown (Cust unbekent). The map records a naval battle between the Dutch and Portuguese in which the Dutch captured a Portuguese galleon in 1603.