Various hard coral reefs in Gorontalo, Indonesia. Diver is swimming to look around the coral reefs. There are acropora, fire coral, branch coral, pillar coral and etc. Shutterstock . vector - Various hard coral reefs in Gorontalo, Indonesia. Diver is swimming to look around the coral reefs. There are acropora, fire coral, branch coral, pillar coral and etc. - ID: 210788659