Good quiz. A few suggestions though, other than what Highlander said. You might want to find a better clue for Ethiopia (maybe Addis Ababa or second most populous African Nation). Also I have one other nitpick, the Andes is the longest mountain range on land, however the Mid Atlantic Ridge is longer.
Theres a lot of problems, although it was fun to do. The first one was vague; you could say kiwis just as well, because the word natives can also mean people who were born there, although I do know the Maori were there before the majority of today's "kiwis". The Ethiopia one was also vague; while it is the largest in Africa starting with E, there's a lot of other nations quite big as well. Singapore doesn't border Malaysia by land; they are separated by a river, although there are bridges. they do border by sea, but jetpunk never counts that.
I kept trying variations of "Kingdom of the Netherlands" because K and N are very different letters. Also fully agree with the other comments here, but it doesn't appear there will be any updates at this point.