Final answer:
The island kingdom mentioned in the question is likely Tonga, as it is known for its conservation efforts and is the only remaining monarchy in the Pacific region.
Step-by-step explanation:
The carved boats that are possibly meant to protect the coral could refer to efforts made in various island nations to preserve their marine habitats.
The Kingdom of Tonga is a standout example among the island nations of the Pacific, not only for its ecological efforts but also as a monarchy that maintained its sovereignty even throughout the colonial era.
Given the importance of marine ecosystems and tourism to Tonga's economy and cultural heritage, it is plausible that protective measures such as the use of carved boats to guard coral reefs could be part of their conservation tactics to ensure the health and longevity of their vital marine environments.
Thus, the island kingdom mentioned in the question is likely Tonga, which is located south of Samoa and is known for its 36 inhabited islands and rich cultural traditions, including the historical preservation of its monarchy, the only one in the Pacific.