Generate a sentence with the given entities and relation.
Relation: mouth of the watercourse
Head Entity: Mackenzie; Tail Entity: Beaufort Sea
Sentence: The Peel watershed drains 14 % of the Yukon Territory Canada and flows into the Beaufort Sea via the Peel and then Mackenzie Rivers .
Relation: mouth of the watercourse
Head Entity1: ; Tail Entity2:
Sentence: