How do we pronounce Japan?

Excuse me, but I'm curious about something. I've noticed that different people seem to pronounce the name of the country "Japan" in slightly different ways. Could you perhaps enlighten me on the correct pronunciation of "Japan"? Is it "Jap-an" with a clear distinction between the two syllables, or is it more of a flowing "Jap-uhn" sound? I'm eager to learn the correct way to say it, so I can avoid any potential misunderstandings or mispronunciations in the future. Thank you in advance for your help.