user: ### NOW ANSWER:
Question: What is the Year named of the Ganga Valles?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Ahsabkab Vallis', '24.0S', '79.0E', 700.0, 2000.0]
SQL:

assistant: SELECT MAX("Year named") FROM "Table" WHERE "Name" = 'Ganga Valles';