evidence: Rockall, an uninhabited islet measuring just 100ft (30m) wide and 70ft (21m) high, is a remnant of an eroded volcano. [...] The lucrative seabed around Rockall, rich in oil and gas possibilities as well as fish, has been the subject of rival claims from Ireland, Iceland and Denmark (on behalf of the Danish Faroe Islands). [...] A European Commission spokeswoman told BBC News NI that "the question of sovereignty over Rockall is a matter of international law".