iD Yes, in the meantime, this is possible. Please see that same / very similar question: [how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag](/questions/22542/how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag) (old text from May 2013: ) <s>iD is just released, not every possible feature is implemented. Relations (which multipolygons are) are coming. Please see that same / very similar question: [how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag](/questions/22542/how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag)coming.</s>

iD is just released, not every possible feature is implemented. Relations (which multipolygons are) are coming. Please see that same / very similar question: [how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag](/questions/22542/how-do-i-do-an-island-in-a-lake-using-id-and-the-multipolygon-tag)