The main tributaries are the Efze, the Gilsa, the Grenff and the Antrift.

Entity and relation annotations:
id: 0
type: entity
value: text: the Efze
labels: <Location>
id: 1
type: entity
value: text: the Gilsa
labels: <Location>
id: 2
type: entity
value: text: the Grenff
labels: <Location>
id: 3
type: entity
value: text: the Antrift
labels: <Location>