Learn Farsi: چه کویر پهناور و گرمی!

In this exclamatory structure, the indefinite enclitic ی (-i) attaches to the very end of the entire noun phrase. Since the noun کویر is modified by the adjectives پهناور and گرم, the ی waits until the final adjective to attach, forming گرمی.

Does this sentence use the Ezafe to link the words?

Yes, there is an unseen Ezafe linking the noun کویر to the first adjective پهناور (pronounced kavir-e pahnavar). However, because پهناور is joined to گرم by the conjunction و (and), there is no Ezafe after پهناور.

The lesson mentions the structure چه + Adjective + Noun + ی. Why does the noun come first in this sentence?

Farsi allows two word orders for exclamations. The one used here is چه + Noun + Ezafe + Adjective(s) + ی. The alternative you learned (چه + Adjective + Noun + ی) is also correct and often sounds a bit more emphatic or literary, but the noun-first structure used in this sentence is very natural and common in everyday speech.

How does the pronunciation flow in conversational Farsi for the phrase پهناور و گرمی?

Native speakers typically reduce the conjunction و (va) to a quick -o sound. In spoken Farsi, the whole phrase flows together smoothly as kavir-e pahnavar-o garmi.