What is this organism?

He is an expert in oceanography.

My major is oceanography.

This train is reserved seats only.

Marine pollution is a global issue, and all countries should cooperate to find a solution.

The leatherback sea turtle is the largest sea turtle in the world, reaching about 2 meters in length in mature individuals.

The loggerhead sea turtle is designated as an endangered species.

I found an immature Japanese pond turtle in the park pond.

I live in Zenikame.

Have you ever seen a giant tortoise?