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The Willem River or Willems River was named during the voyage of the Dutch East India Company (Vereenigde Oostindische Compagnie, or VOC) ship Mauritius in 1618, under the command of Supercargo Willem Janszoon and captained by Lenaert Jacobszoon, and is one of the few features named on a nautical chart made in 1627.
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From that information Willems River would almost certainly have been named after Supercargo, Willem Janszoon, the Commander of the ship Mauritius. Janszoon was captain of the Duyfken in 1605-1606, when part of the Gulf of Carpentaria was mapped, during the earliest documented visit to Australia by a vessel from the Netherlands.
Caert van't Landt van d'Eendracht ("Chart of the Land of Eendracht") is a 1627 chart made by Hessel Gerritsz and is one of the earliest charts showing the coastline of Western Australia. The Willems River is located to the extreme left (north) end of the coastline on the chart and a closer view is provided below.
Willems River - Ashburton River
It is believed that the Willems River of 1618 is the Ashburton River (Western Australia).
The chart shows Willems revier, besocht by 't volck van 't Schip Mauritius in Iulius A° 1618 ("Willem's River, visited by the crew of the ship Mauritius in July 1618").
The detail of the rivers position on the chart, backs up the claim that this is the Ashburton River, which, being at 21 degrees 40 minutes south and 114 degrees 56 east, is almost exactly the latitude shown on the chart. The chart is oriented with north to the left, showing lines of latitude from 20th parallel south to the 35th parallel south at the base of the map. The lines of latitude appear to be very accurate, matching closely known features through the length of the chart.
Other factors to back up that this is the Ashburton river is that it takes almost a 90 degree turn north-east, once in the mouth, as shown on the chart, and the northern headland of the river mouth in reality is of the same shape as shown on the chart.
1627 chart accuracy
A note on the chart's accuracy is given by the author Heeres in 1899, from the following excerpt.
The 1627 chart is specially interesting. Gerritsz., at the time cartographer in ordinary to the E.I.C., has "put together this chart of the Landt van d'Eendracht from the journals and drawings of the Steersmen", which means that he availed himself of authentic data [***]. He acquitted himself of the task to admiration, and has given a very lucid survey of the (accidental) discoveries made by the Dutch on the west-coast of Australia. In this chart of 1627 the Land of d'Eendracht takes up a good deal of space. To the north it is found bounded by the "Willemsrivier", discovered in July 1618 by the ship Mauritius, commanded by Willem Janszoon [****]. According to the chart this "river" is in about 21° 45' S. Lat., but there are no reliable data concerning this point.
[*** It is evident that he did not use all the data then available. Thus, for instance, he left unused those furnished by the Zeewolf (No. VIII, pp. 10 ff. below), and those of the ship Leiden (No. XV, p. 49).]
[**** See the Documents under No IX (pp. 12f.).]
What Heeres means by the sentence, According to the chart this "river" is in about 21° 45' S. Lat., but there are no reliable data concerning this point, is that in 1899 they had no reliable information about exactly what was at that latitude.
Mauritius at North West Cape
On 31 July 1618, the Mauritius reached North West Cape (west of Exmouth Gulf), where crew members went ashore and saw footprints; this was the closest that Europeans had yet come to making contact with indigenous Australians in Western Australia.
Janszoon and Jacobszoon assumed that the cape was an island: the notion later took hold amongst mariners and cartographers, to the extent that it was named "Cloates Island" in 1720 and this misconception lingered until the 19th century.
As the Willems River was also named in July it would appear that the Mauritius, which reached Bantam, Indonesia on 22 August 1618, discovered the river on the same day that they reached North West Cape (31 July 1618).
The 1627 chart was based on a number of voyages, beginning with the 1616 voyage of Dirk Hartog. On that voyage Hartog named Eendrachtsland after his ship, the Eendracht meaning "Unity". Eendrachtsland is one of the earliest names given to the Australian mainland.