This is the 7866th most frequent Japanese word.
四国
Shikoku: One of the four main islands of Japan.
Here, '四国' signifies the region as a travel destination, emphasizing its role in the individual's travel plans.
彼は四国を旅行する計画を立てています。
He is planning to travel through Shikoku.
In this example, '四国地方' describes an area and its associated cultural characteristics, expanding '四国' with '地方' to specify the region.
四国地方の伝統文化に触れることができます。
You can experience the traditional culture of the Shikoku region.
In this sentence, '四国' is used as a noun referring to Shikoku, the proper geographical region.