Yes it's difficult for you as you probably need to translate first, and we can only give whole minutes, ideally this should have been two and a half minutes, most managed to complete though, still a good quiz from Harry.
No, but as Major Mark has now ruined it :-
1/. A lake is a fully landlocked piece of water, the Caspian Sea (ignore sea) is a salt water sea that is landlocked, so by definition is the largest lake (by all means check it)
2/. If the clue is about Antarctica and I put the Antarctic Ocean then even Kenmen would get it? it is, and always has been also known as the Southern Ocean, reminder this is an English server, there is no other word for instance than 'The English Channel', or 'The Fa