Yes, I had that problem - I thought there was a flaw in the questions until I re-read the rubric - "All the countries border the ones that come before and after."
This might be a bit nitpicky, but the Yellow River clue is the same clue for both the #1 and #2 quizzes of this series. Maybe mix it up by having another clue for China?
The clue could certainly be improved making it something actually about the country - such as the name of the river running through its capital, or the name of the famous square or bridge in the capital, a well-known city that is known for making an internationally famous style of beer, a famous author who was born here - there are many more interesting questions to ask. if I were from this country, I'd probably be a little disappointed in this clue.
Apart from a couple of clues ("Z" and junta for me), the other ones can be guessed without knowing the bordering one. I would have liked more a quiz with more vague clues, which only apply to one of the bordering countries of the previous guess.
That would be more challenging.
just take a boat through the Mediterranean and go through the Suez canal and and keep going south till you find sudan