Worst scenery omissions.

What is the worst scenery omission/mistake in FSX. I think its omitting Loch Erne(Lake) in Ireland. Loch Erne is a large system that straddles the border between North and Southern Ireland. During World War Two it played a pivotal role as a sea plane base during the Battle for the Atlantic and has many famous sea planes resting on lake bed. If FS9 can include the scenery why can't FSX? 
