Charles Ellicott Commentary Isaiah 33:9

"The land mourneth and languisheth; Lebanon is confounded and withereth away; Sharon is like a desert; and Bashan and Carmel shake off [their leaves]." — Isaiah 33:9 (ASV)

The earth mourneth ... — Lebanon, with its cedars, the Sharon (as we say, the Campagna), Bashan, with its oaks (Isaiah 2:13), Carmel, with its copse-wood, are the symbols of beauty and fertility, now languishing and decaying. Possibly the embassy referred to was sent in the autumn, so that the prophet saw in the natural features of that season the symbols of failure and decay.