Question: What is the Diameter (km) of the Valle with a Longitude of 152.5e named before 1997?
SQL: SELECT MAX("Diameter (km)") FROM "2-16799784-1" WHERE "Longitude" = '152.5e' AND "Year named" < 1997.0;

Question: What is the Year named of the Ganga Valles?
SQL: SELECT MAX("Year named") FROM "2-16799784-1" WHERE "Name" = 'Ganga Valles';

Question: What is the Latitude of the Alajen Vallis named after 1997?
SQL: SELECT "Latitude" FROM "2-16799784-1" WHERE "Year named" > 1997.0 AND "Name" = 'Alajen Vallis';