No identifying text as to engraver or publisher. The style (compass rose) is similar to those by Nicolas Bellin found in Abbé Prévost's 'Histoire Général des Voyages', perhaps a Danish translation?
Titled in Danish in the cartouche:
I mundingen Af
udkastet efter de sejlendes observa-
tioner af N.B.
Ing. de la Marine
Franske og engelske Sø = miil
Map of the islands in the mouth of the the river Canton
draft by the seamen's observations of
N. B. Marine Engineer
French and English __ = mile
Folded in three, from book (?). Top right has 'No. 12', bottom right 'VIII D'
Some browning along border, couple of pinholes.
35.5 x 21 cm