Passage: On 18 November 1605, the Duyfken sailed from Bantam to the coast of western New Guinea. After that, Janszoon crossed the eastern end of the Arafura Sea into the Gulf of Carpentaria, without being aware of the existence of Torres Strait. The Duyfken was actually in Torres Strait in February 1606, a few months before Spanish explorer Luís Vaz de Torres sailed through it. On 26 February 1606, Janzoon made landfall at the Pennefather River on the western shore of Cape York in Queensland, near what is now the town of Weipa. This is the first recorded European landfall on the Australian continent. Janszoon proceeded to chart some 320 km (200 mi) of the coastline, which he thought was a southerly extension of New Guinea.

Question: What was Janszoon unaware of on journey?
the existence of Torres Strait