The first map, from 1897, shows which nations had responsibility for controlling which areas during the early stages of the European naval blockade of Crete. Germany didn’t take a major part in the blockade since she had only one small warship on station and both Austro-Hungary and Germany withdrew form the Concert of Europe and the Cretan Intervention in March/April 1898.
The second map shows the division of the island between the remaining four Powers in April 1898.
From left to right the areas of responsibility are: Selinos: Italian, Rethymnon: Russian, Candia (Iraklion) British and Lassithi; French. The then capital of Crete, Canea, and Suda Bay were under joint multi-national control.