> The island is huge ... If you've seen islands ... or off the Atlantic or Pacific coast, you're thinking too small.

Maybe along the US coasts, but a bit further up north, there are significantly larger islands along both coasts[0]:

>> 16 Newfoundland | 108,860 square km | 42,030 square miles | Canada (Newfoundland and Labrador)

>> 43 Vancouver Island | 31,285 square km | 12,079 square miles | Canada (British Columbia)

>> 75 Hawaiʻi (Big Island) | 10,434 square km | 4,029 square miles United States (Hawaii)

[0]https://en.wikipedia.org/wiki/List_of_islands_by_area

(edited for clarity)