The Brazilian city of Belem at the mouth of the Amazon is a showcase of products from the great river basin. Now the famed acai berry is expanding Belem's reputation. Reclusive river people, called ribeirinhos harvest the berries by climbing the tall palms where they grow and rush the produce by boat to the port. There they trade for other goods, and quickly escape the city to return to their tranquil, timeless lives at the edge of the world's greatest river. Host David Yetman takes us through Belem and visits the homes of the river people.