* The official website of the managing agency: This could be the US Forest Service, Bureau of Land Management, or another relevant agency depending on the location of Fishhooks Wilderness.
* A reputable online database: Websites like Wikipedia or the National Wilderness Preservation System website might have information about the area.
* Maps and guides: Hiking and wilderness guides often include details about wilderness areas, including their size.
Please provide me with the location of Fishhooks Wilderness and I can try to give you more specific guidance.