How to split a way in a relation

Help and support
1

I have a lake that is part of a relation, there are unmapped strips of land that split apart the lake

How do i split the lake into a multipolygon relation while keeping the other relation intact

2

First, download the whole relation. In JOSM, it’s ctrl-meta or alt-D by default, and in Id, it’s going to be the download button on the relation in the list, if it’s not already downloaded.

After that either editor should let you split.

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3

To explain it in more detail: The editors also have to sort the ways in order to prevent the route from getting unordered (i.e. cause gaps) by the split. iD is strict and only allows you to split ways if the neighbouring ways have been downloaded (which does mean you don’t need to download the whole relation but it’s naturally easier when you do this) whereas JOSM allows you to split the way regardless but will ask you to download the neighbouring ways anyway for the same reason.

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