The Saint Marys River and the Suwannee River both originate in the swamp.

Entity and relation annotations:
id: 0
type: entity
value: text: The Saint Marys River
labels: <Location>
id: 1
type: entity
value: text: the Suwannee River
labels: <Location>
id: 2
type: entity
value: text: the swamp
labels: <Location>