Premise: The Loire is the longest river in France ' flowing an impressive 1,010 km (630 miles) from its source in the Vivarais mountains south of Saint-Etienne to its estuary west of Nantes ' but the region of the most interesting chateaux, from Chambord to Angers, covers barely a fifth of that distance.

Hypothesis: France's longest river is the loire.
Relation: entailment