To find the area of a triangle, we can use the formula:
Area = (base * height) / 2
Given that the base of the triangle is 22.7 miles and the height is 38.1 miles, we can substitute these values into the formula:
Area = (22.7 * 38.1) / 2
= 864.27 / 2
= 432.135
Therefore, the area of the triangle is 432.135 square miles.