Sapporo Dome (札幌ドーム）
Official site (in English)

Sapporo Dome is located  in Hitsujigaoka in Hokkaido.

It seats up to around 53,000.
Seating chart. (note that this does not show Arena seats.  These tend to vary depending on the set up of the stage)

Access:
札幌市営地下鉄東豊線 Sapporo City Metro Toho Line (light blue line) 《福住駅》 Fukuzumi Station.
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There are MANY venues across Japan that are used by JE.

Here are a few, and info on how to get to them.

※The titles (in orange) are links to Google Maps.

( Tokyo Venues )