Perhaps the author intends with a bold personification to speak of the almost dried-up rivers as dry-throated, siccis faucibus would then be well taken as ablative of description.
For there, as it is most narow, it is more than a myle of brede.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "siccis" in a variety of sentences. We hope that you will now be able to make sentences using this word.