What are "long green onions"?

Watching the Cooking with Dog series, and they keep referencing long green onions, but it looks like they are using leeks, is that what those are? Or is there some mutant green onion in Japan that's really that big?

submitted by /u/Twisted_Schwartz_
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from Japanese Food http://bit.ly/2rWR5Uy https://ift.tt/eA8V8J