You are given a sentence in Japanese. Your job is to translate the Japanese sentence into English.
Example: 第一にキリバス共和国が彼ら自身の利益になると理解したからです
Example solution: And it was primarily because Kiribati realized that this was in their own self-interest to do this.
Example explanation: The Japanese sentence is correctly translated into English, because the meaning is preserved.

Problem: ではこの湖の海岸線の長さはいくつですか

Solution: What's the length of the coastline of these lakes?