According to the search results, the island that comes after Magma Village in the game Blox Fruits is not explicitly mentioned. However, some sources provide information on the islands that can be found in the game and their locations. For instance, and provide a list of islands and their entry requirements, while provides a guide with all the NPCs and their locations. Based on these sources, players can explore the following islands after Magma Village:

• Underwater City: This island can be reached by heading south from the Frozen Village dock area towards the edge of the map. It requires a level of 375 to enter.
• Upper Skylands: This area can be accessed by unlocking and using the flying spell to reach the floating island in the middle part of the map. It requires a level of 150 to 200 to enter, and there are other unlockable areas that require a level of 450 to 575.
• Fountain City: This island is located on the floating island behind the Colosseum and requires a level of 625 to enter.

It is important to note that the game is constantly updated, and new islands may be added in the future.