This is the 191st most frequent Japanese word.
北海道
Hokkaido: Japan's northernmost main island.
Here, 北海道 is used as a proper noun to refer to a geographical location, an island in Japan.
北海道は日本の北の島です。
Hokkaido is the northern island of Japan.
In this sentence, 北海道 denotes a location where the action (enjoying skiing) took place.
北海道でスキーを楽しみました。
I enjoyed skiing in Hokkaido.
Here, 北海道 is used to describe the origin of the crabs, indicating that they come from Hokkaido.