It seems to me that this should be a quite simple challenge.
I have a feature class 'River'. Unfortunately it was digitized without much attention to snapping, therefore it has many small gaps, typically less that 1 meter. In the very old days of Arc/Info a simple 'snap' command would have fixed this quickly ... So I assumed it to be equally simple in ArcMap 10.3
I found the tool 'Snap (Editing)' but it doesn't seem to do anything.
What is the easiest way to close many small gaps like this.