Why are maritime boundaries particularly significant to countries in The Pacific Realm?

Will check for plag.

Please answer the question in 3 to 4 paragraphs.
Grade criteria:
1. Topic Sentence: You must begin your answer with a clear topic sentence.
2. Supporting Points: You must provide at least three clear and distinct arguments to support the assertion that you have made in your topic sentence.
3. Grammar:Points will be deducted for grammatical errors.