English: Map indicating some possible positions of the ' Pass of Cambalão', the position where the Portuguese force under Duarte Pacheco Pereira held against the Zamorin of Calicut during the Battle of Cochin in April, 1504. The map is highly conjectural, based roughly on the modern geography of Kochi and Vembanad lake, which has probably changed substantially since the 16th C. Green dots = possible locations of the Portuguese position, Straight line = most probable route of Calicut army; Dotted line = alternative longer route for army of Calicut.