Four Chapters on One Thing (4-Catutthavagga)
AN 1.333–377 Catutthavagga
333. "Just as, mendicants, in the Black Plum Tree Land the delightful parks, woods, meadows, and lotus ponds are few, while the hilly terrain, inaccessible riverlands, stumps and thorns, and rugged mountains are many; so too the sentient beings born on land are few, while those born in water are many.