Taiwan
noun, proper noun, の adjective
The machine gulf isn't what you'd expect. In fact, looking at the reading will probably help the most first, since this word represents Taiwan.
The reading is たい for 台, which is a little different from what you learned, but not the end of the world (especially if you can get the meaning down). The わん is however what you learned, so even if you arrive to だいわん, you'll probably realize that this is たいわん.
感染源を台湾のアヒルの群れだと突き止めました。
We’ve traced the source of the infection and it was a flock of ducks in Taiwan.