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.