user: Question: Nagua has the area (km²) of?
Columns: ['Province', 'Capital', 'Area (km²)', 'Population', 'Density', 'Map region']
Types: ['text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['Dajabón', 'Dajabón', '1020.73', 62046.0, 61.0, 4.0]
SQL:

assistant: SELECT "Area (km²)" FROM "Table" WHERE "Capital" = 'Nagua';