a business in which opportunities 'abound' [=a business in which there are many opportunities]
They live in a region that 'abounds in/with' oil.
They live in a region where oil 'abounds'.
(..) a man of learning, a voracious reader. He could recite the Iliad in ancient Greek while fishing for trout in a rippling creek. Endowed with wisdom, ofjudgment sound, nevertheless about him the questions abound. (HlSSING) HARRY: How does Mr. Trask make such wonderful deals? Why did the trustees (..)1992 Scent of a Woman